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Journal articles on the topic '4'-dihydroxy·5·methoxyblbenzyl'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

P., L. Majumder, and Bandyopadhyay (nee Guha) Saswati. "Stilbenoids and sesquiterpene derivatives of the orchids Gastrochilum calcoelaria and Dendrobium amoenum : Application of 2D NMR spectroscopy in structural elucidation of complex natural products." Journal of Indian Chemical Society Vol. 87, Feb 2010 (2010): 221–34. https://doi.org/10.5281/zenodo.5778416.

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Department of Chemistry, University College of Science, 92, Acharya Prafulla Chandra Road, Kolkata-700 009, India <em>E-mail :</em> priyalalm@hotmail.com <em>Manuscript received 2 February 2010, accepted 3 February 2010</em> Systematic chemical Investigation of the Indian orchid <em>Gatrochilum calcoelaria</em> D.Don for the first time afforded two new bibenzyl derivatives, designated gastrochilin and gastrochilin, besides the compounds confusarin [2, 7- dihydroxy-3,4,8-trimetboxyphenanthrene] and 2, 7-dlhydroxy-3,4,6-trimethoxyphenanthrene. The orchid <em>Dendrobium</em> amoenum Wall was

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2

Shoja, M. "4',5-Dihydroxy-7-methoxyflavanone." Acta Crystallographica Section C Crystal Structure Communications 46, no. 10 (1990): 1969–71. http://dx.doi.org/10.1107/s0108270190002979.

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3

Brito, Iván, Jorge Bórquez, Mario Simirgiotis, Alejandro Cárdenas, and Matías López-Rodríguez. "4′,5-Dihydroxy-7-methoxyflavanone dihydrate." Acta Crystallographica Section E Structure Reports Online 68, no. 1 (2011): o32—o33. http://dx.doi.org/10.1107/s1600536811051221.

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4

Usman, Hanapi, Muhammad N. Jalaluddin, Euis H. Hakim, Yana M. Syah, and Bohari M. Yamin. "2′,4′-Dihydroxy-5′,6′-dimethoxychalcone." Acta Crystallographica Section E Structure Reports Online 62, no. 1 (2005): o209—o211. http://dx.doi.org/10.1107/s160053680504047x.

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5

Naz, Syeda Sohaila, Nazar Ul Islam, M. Nawaz Tahir, and Muhammad Raza Shah. "Methyl 2,4-dihydroxy-5-(4-nitrobenzamido)benzoate." Acta Crystallographica Section E Structure Reports Online 69, no. 2 (2013): o207. http://dx.doi.org/10.1107/s160053681300024x.

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In the title compound, C15H12N2O7, the dihedral angle between the aromatic rings is 4.58 (13)° and the nitro group is rotated from its attached ring by 18.07 (17)°. Intramolecular N—H...O and O—H...O hydrogen bonds generateS(5) andS(6) rings, respectively. In the crystal, molecules are linked by O—H...O hydrogen bonds, generating [001]C(7) chains. The chains are linked by C—H...O interactions, forming a three-dimensional network, which incorporatesR22(7) andR22(10) loops.

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6

SHOJA, M. "ChemInform Abstract: 4′,5-Dihydroxy-7-methoxyflavanone." ChemInform 22, no. 4 (2010): no. http://dx.doi.org/10.1002/chin.199104076.

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7

Domínguez-Villegas, Valeri, Vanessa Domínguez-Villegas, María Luisa García, Ana Calpena, Beatriz Clares-Naveros, and María Luisa Garduño-Ramírez. "Anti-inflammatory, Antioxidant and Cytotoxicity Activities of Methanolic Extract and Prenylated Flavanones Isolated from Leaves of Eysehardtia platycarpa." Natural Product Communications 8, no. 2 (2013): 1934578X1300800. http://dx.doi.org/10.1177/1934578x1300800211.

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From the methanolic extract of Eysenhardtia platycarpa (leaves), were isolated the prenylated flavanones: 5,7-dihydroxy-6-methyl-8-prenylflavanone (1), 5,7-dihydroxy-6-methyl-8-prenyl-4′-methoxy-flavanone (2), 5,7-dihydroxy-6-prenylflavanone (3), 5-dihydroxy-7-methoxy-6-prenylflavanone (4), 5,7-dihydroxy-8-prenyl-4′-methoxy-flavanone (5). Methanolic extract of E. platycarpa (leaves) and flavanones (5), (2) and (3) showed anti-inflammatory activity according to tested quantities. In addition, flavanone (5) revealed the best percentage reduction of free radical DPPH. Finally, after cytotoxic act

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8

Liu, Jian, Hao-Fu Dai, Jiao Wu, Yan-Bo Zeng, and Wen-Li Mei. "Flavanes from Dracaena cambodiana." Zeitschrift für Naturforschung B 63, no. 12 (2008): 1407–10. http://dx.doi.org/10.1515/znb-2008-1210.

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Two new flavanes, (2S)-4′ ,7-dihydroxy-6,8-dimethylflavane (1), and (2S)-5,7-dihydroxy-4′-methoxy- 8-methylflavane (2), together with five known flavanes, (2S)-3′ ,7-dihydroxy-4′-methoxy-8- methylflavane (3), (2R)-4′,7-dihydroxy-8-methylflavane (4), (±)-3′,7-dihydroxy-4′-methoxyflavane (5), (±)-4′,7-dihydroxy-3′-methoxyflavane (6), and (2S)-4′,7-dihydroxyflavane (7), were isolated from the stem of Dracaena cambodiana. Their structures were determined by spectroscopic techniques (UV, IR, 1D and 2D NMR). Their antimicrobial activities were preliminarily examined by the filter paper disc agar dif

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9

Elix, JA, JA Elix, JH Wardlaw, and JH Wardlaw. "Hypoalectorialic Acid and Conechinocarpic Acid, Two New Benzyl Esters From Lichens." Australian Journal of Chemistry 49, no. 6 (1996): 727. http://dx.doi.org/10.1071/ch9960727.

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The benzyl esters hypoalectorialic acid [6-(2',4'-dihydroxy-3',6'-dimethylbenzoyloxymethyl)-2,4-dihydroxy-3-methylbenzoic acid] (5) and conechinocarpic acid [1',4'-dihydroxy-6'-methoxy-3'-oxo-1',3'-dihydroisobenzofuran-5'-ylmethyl 2-hydroxy-4-methoxy-3,6-dimethylbenzoate (7) have been isolated from the lichens Hypotrachyna hypoalectorialica and Relicina samoensis respectively. The structure of the compounds (5) and (7) followed from a combination of spectroscopic and chemical data.

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10

Geng, Di, Lian Jin Weng, Yuan Yuan Han, and Xin Yang. "Flavonoids from Illicium dunnianum." Advanced Materials Research 610-613 (December 2012): 3375–77. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.3375.

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AIM：To investigate the chemical constituents of Illicium dunnianum. METHODS: A series of flavonoids were isolated and purified by various chromatographic techniques and their structures were elucidated by physicochemical and spectral data. RESULTS: Ten known flavonoids were isolated and identified as isoliquiritigenin (1), 7, 4′-Dihydroxy-5-methoxy flavanone (2), 3-(2, 4-dihydroxybenzyl)-5,7-dihydroxychroman-4-one (3), (3R)-5, 7-dihydroxy- 3-(4-hydroxybenzyl)- 6-methyl-chroman-4-one (4), 2, 5-dihydroxy-7-hydroxymethyl isoflavone (5), galangin (6), pinocembrin (7), kaempferol (8), 5,7,3′,4′-te

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11

Rijal, Chairul, Winarto Haryadi, and Chairil Anwar. "Synthesis of Chalcone Derivatives from Halogenated Vanillin and their Activity Test as Antioxidant." Materials Science Forum 1061 (May 26, 2022): 59–65. http://dx.doi.org/10.4028/p-5k5d4j.

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Synthesis of 3-chloro-4-hydroxy-5-methoxybenzaldehyde, 3-bromo-4-hydroxy-5-methoxybenzaldehyde and 2',4'-dihydroxy-3-bromo-4-hydroxy-5-methoxyhalcone and evaluation of their antioxidant activity have been carried out. 3-Chloro-4-hydroxy-5-methoxybenzaldehyde was obtained through chlorination of vanillin using Ca(ClO)2, while 3-bromo-4-hydroxy-5-methoxybenzaldehyde was obtained via bromination of vanillin using KBrO3 in glacial acetic acid solvent and 47% HBr catalyst. Then, 2',4'-dihydroxy-3-bromo-4-hydroxy-5-methoxychalcone was prepared from 3-bromo-4-hydroxy-5-methoxybenzaldehyde and 2-4-dih

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12

Ticha, Lawrence A., Jeremy A. Klaasen, Ivan R. Green, Sivapregasen Naidoo, Bienyameen Baker, and Ray-Dean Pietersen. "Phytochemical and Antimicrobial Screening of Flavanones and Chalcones from Galenia africana and Dicerothamnus rhinocerotis." Natural Product Communications 10, no. 7 (2015): 1934578X1501000. http://dx.doi.org/10.1177/1934578x1501000713.

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This study focused on an 80% ethanol:water extract of Galenia africana and Dicerothamnus rhinocerotis in which a phytochemical study revealed the presence of flavonoids as the major secondary plant metabolites. Eleven pure flavonoids viz., ( E)-2′,4′-dihydroxychalcone 1, ( S)-7-hydroxyflavanone 2, ( E)-2′,4′-dihydroxy-2,3-dihydrochalcone 3, ( S)-5,7-dihydroxyflavanone 4, ( S)-2′,5,7,-trihydroxyflavanone 5, ( S)-5,7-dihydroxy-2′-methoxyflavanone 6, 5,7-dihydroxy-4H-chromen-4-one 7, ( S)-5-hydroxy-7-methoxyflavanone 8 and ( E)-2-hydroxy-3′,6′-dimethoxychalcone 9 were isolated from G. africana, w

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13

Uyanik, Cavit, James R. Hanson, and Peter B. Hitchcock. "The Stereochemistry of the 1,2-Addition of Grignard Reagents to Some Steroidal Unsaturated Ketones." Journal of Chemical Research 2003, no. 8 (2003): 474–76. http://dx.doi.org/10.3184/030823403103174588.

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The stereochemistry of 3β,17β-dihydroxy-3α-ethylandrost-4-ene, 3α,17β-dihydroxy-3β-methylestr-4-ene and 3β-acetoxy-7α,17β-dihydroxy-7β-methylandrost-5-ene, which were obtained by Grignard reactions from the corresponding αβ-unsaturated ketones, have been established by X-ray crystallography.

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14

Kouam, Jacques, Alain L. Meli, Victor Kuete, and Zacharias T. Fomum. "Flavanones from the Stem Bark of Erythrina Sigmoidea." Natural Product Communications 3, no. 11 (2008): 1934578X0800301. http://dx.doi.org/10.1177/1934578x0800301120.

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Chemical analysis of the stem bark of Erythrina sigmoidea Hua yielded two new flavonoids, designated sigmoidin M (1) and sigmoidin N (2). Their structures were established by chemical and spectroscopic means as 5,7-dihydroxy-3′-O-prenyl-(3″,4″-dihydroxy-2″,2″-dimethylpyrano)[5″,6″:4′,5']flavanone (1) and 5,7,3′-trihydroxy-(3″-hydroxy-2″-(1-hydroxyisopropyl)-[4′,5:4″,5″]furanoflavanone (2), respectively. Sigmoidin M exhibited antimicrobial activity.

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15

Ashok, D., and K. Aravind. "Microwave Assisted Synthesis of New 1-{2, 4-Dihydroxy-5-[5-(aryl)-1-pyridine/pyrimidine-4-carbonyl)-4, 5-dihydro-1H-pyrazol-3-yl]-phenyl}-3-(aryl)-propenones and their Antibacterial Activity." E-Journal of Chemistry 6, no. 2 (2009): 323–31. http://dx.doi.org/10.1155/2009/982746.

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A series of 1-{2, 4-dihydroxy-5-[5-(aryl)-1-pyridine/pyrimidine-4-carbonyl)-4, 5-dihydro-1H-pyrazol-3-yl]-phenyl}-3-(aryl)-propenones (2a-h) have been synthesized from 1-[2,4-dihydroxy-5-(aryl acryloyl)phenyl]-aryl propenones(1a-h)by Micheal addition with isoniazide/pyrazinic acid hydrazide under microwave irradiation and classical heating. The synthesized compounds were characterized by IR,1H-NMR,13C-NMR and Mass spectral data. All the compounds were screened for their Antibacterial activity.

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16

Kumar, N., S. Roy, V. S. Parmar, and W. Errington. "2',4'-Dihydroxy-2-[3-(4-methylphenyl)isoxazol-5-yl]acetophenone." Acta Crystallographica Section C Crystal Structure Communications 54, no. 8 (1998): 1123–25. http://dx.doi.org/10.1107/s0108270198003102.

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17

Abdullah, Siti Awanis, Siti Mariam Abdul Lathiff, and Shajarahtunnur Jamil. "Acetylcholinesterase Activity of Crude Extracts and Flavonoids from Artocarpus anisophyllus Miq. and Artocarpus lowii King." Journal of Science and Mathematics Letters 10, no. 2 (2022): 62–66. http://dx.doi.org/10.37134/jsml.vol10.2.7.2022.

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A flavonoids-rich extract and seven flavonoids from the leaves and heartwoods of A. anisophyllus Miq. and A. lowii King were investigated for their inhibitory effects against acetylcholinesterase enzyme. The flavonoids were fully characterized spectroscopically as artocarpin (1), isobavachalcone (2), pyranocycloartobiloxanthone A (3), 5,7-dihydroxy-4'-methoxy-6-prenylflavanone (4), 5-hydroxy-7,8-(2,2-dimethylchromano)-4'-methoxy-flavanone (5) 4',5-dihydroxy-6,7-(2,2-dimethylpyrano)-2'-methoxy-8-γ,γ-dimethylallylflavone (6) and 2',4'-dihydroxy-3,4-(2",2"-dimethylchromeno)-3'-prenyldihydrochalco

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18

Aye, Mya Mu, Hnin Thanda Aung, Zaw Min Thu, et al. "Constituents of the Rhizomes of Sansevieria cylindrica." Natural Product Communications 13, no. 9 (2018): 1934578X1801300. http://dx.doi.org/10.1177/1934578x1801300908.

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A new sappanin-type 3-benzyl chroman-4-one (homoisoflavanone), (3 S)-3-(4'-methoxybenzyl)-3,5-dihydroxy-7-methoxy-6-methyl chroman-4-one (1), together with known congeners (3 S)-3-(4'-methoxybenzyl)-3,5-dihydroxy-7-methoxy chroman-4-one (2), (3 S)-3-(4'-hydroxybenzyl)-3,5-dihydroxy-7-methoxy-6-methyl chroman-4-one (3), (3 S)-3-(4'-hydroxybenzyl)-3,5-dihydroxy-7-methoxy chroman-4-one (4), 3-(3’,4'-methyledioxybenzyl)-7-hydroxy-8-methoxy chroman-4-one (5), and stigmasterol and ergosterol peroxide have been isolated from the rhizomes of Sansevieria cylindrica, collected in Myanmar. Moreover, the

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19

P., L. Majumder, Chakraborty S., and Sen S. "Stilbenoids and flavonoids from the orchids Coelogyne uniflora, lone paleacea and Acrochoene punctata." Journal of Indian Chemical Society Vol. 79, Feb 2002 (2002): 169–75. https://doi.org/10.5281/zenodo.5873039.

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Department of Chemistry, University College of Science, 92 Acharya Prafulla Chandra Road, Kolkata-700 009, India <em>Manuscript received 12 June 2001. accepted 23 August 2001</em> The orchid <em>Coelogyne uniflora </em>afforded earlier a steroidal ester, uniflorin. Further investigation of this orchid has now resulted in the isolation of two new phenanthropyrone derivatives, unifloranthrone and uniflorinanthrone, besides flavidin (la), flavidinin (lc), isoflvidinin (1d) and oxoflavidin (le). The structures of unifloranthrone and uniflorinanthrone were established as 2,7-dihydroxy5<em>H</e

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20

Elix, John A., Caroline E. Barclay, Judith H. Wardlaw, Alan W. Archer, Sen-hua Yu та Gintaras Kantvilas. "Four New β-Orcinol meta-Depsides from Pertusaria and Siphula Lichens". Australian Journal of Chemistry 52, № 9 (1999): 837. http://dx.doi.org/10.1071/ch99085.

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The new depsides decarboxyhypothamnolic acid [3-(2′,4′-dihydroxy-3′,6′-dimethylphenyloxycarbonyl)-2- hydroxy-6-methoxy-4-methylbenzoic acid] (4) and cryptothamnolic acid [3-(3′-formyl-2′-hydroxy-4′-methoxy- 6′-methylbenzoyloxy)-4,6-dihydroxy-2,5-dimethylbenzoic acid] (6) have been detected in extracts of a Chinese Pertusaria species together with hypothamnolic acid (3) and their structures implied by means of chromatographic and spectroscopic comparisons with synthetic materials. Two further new depsides, neothamnolic acid [3-(5′,7′- dihydroxy-6′ -methyl-1′ -oxo-1′ ,3′ -dihydroisobenzofuran-4′

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21

Sakuma, Y., JI Tanaka, and T. Higa. "New Naphthopyrone Pigments From the Crinoid Comanthus parvicirrus." Australian Journal of Chemistry 40, no. 9 (1987): 1613. http://dx.doi.org/10.1071/ch9871613.

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Two new naphthopyrones, 5,10-dihydroxy-8-methoxy-2-propyl-4H-naphtho[1,2-blpyran-4-one(4) and 5,8-dihydroxy-6,10-dimethoxy-2-propyl-4H-naphtho[2,3-blpyran-4-one (5), have been isolated from the crinoid Comanthus parvicirrus.

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22

Liu, Yang, Ni Zhang, Jun-wei He, et al. "Two New Compounds From the Heartwood of Dalbergia melanoxylon and Their Protective Effect on Hypoxia/Reoxygenation Injury in H9c2." Natural Product Communications 16, no. 1 (2021): 1934578X2098777. http://dx.doi.org/10.1177/1934578x20987776.

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A new neoflavonoid, named as (7 R)-(-)-3′,5-dihydroxy-4′,2,4-trimethoxy-dalbergiquinol (1) and a new phenanthrenedione, named as 3′,7-dihydroxy-3,6- dimethoxy-9-phenyl-1,4-phenanthrenedione (2), together with 4 known compounds, 5- O-methyldalbergiphenol (3), 3′,7-dihydroxy-4′,3,6-trimethoxy-9-phenyl-1,4-phenanthrenedione (4), (+)-obtusafuran (5), and melanoxin (6) were isolated from the heartwood of Dalbergia melanoxylon. Their structures were elucidated on the basis of chemical and spectral evidence, as well as by comparison with literature data. Moreover, compound 1 showed a protective effec

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23

Desta, Zelalem Yibralign, and Runner R. T. Majinda. "Three New Isoflavonoids from Erythrina caffra." Natural Product Communications 9, no. 6 (2014): 1934578X1400900. http://dx.doi.org/10.1177/1934578x1400900622.

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Three new isoflavonoids, 5,7-dihydroxy-2′,4′-dimethoxy-5′-(3-methylbut-2-enyl) isoflavanone (erycaffra A) (1), 5,7-dihydroxy-2′,4′-dimethoxy-5′-(2-hydroxy-3-methylbut-3-enyl)isoflavanone (erycaffra B) (2), and 5,7-dihydroxy-6,8-di-(2-hydroxy-3-methylbut-3-enyl)isoflavone (erycaffra C) (3), were isolated from the stem bark of E. caffra Thunb., along with eight known compounds, namely, alpinumisoflavone (4), isoerysenegalensein E (5), β-amyrin (6), oleanolic acid (7), octacosyl- E-ferulate (8), triacontyl-4-hydroxycinnamate (9), n-tetracosyl p-coumarate (10) and octacosan-1-ol (11). The structur

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24

Ahmed, Sayed A., and Emadeldin M. Kamel. "Cytotoxic Activities of Flavonoids fromCentaurea scoparia." Scientific World Journal 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/274207.

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Phytochemical studies on the ethanolic extract of the aerial parts ofCentaurea scoparialed to the isolation of two new flavonoids, 3′,4′-dihydroxy-(3′′,4′′-dihydro-3′′-hydroxy-4′′-acetoxy)-2′′,2′′-dimethylpyrano-(5′′,6′′:7,8)-flavone-3-O-β-D-glucopyranoside (1) and 3,3′,4′-trihydroxy-(3′′,4′′-dihydro-3′′,4′′-dihydroxy)-2′′,2′′-dimethylpyrano-(5′′,6′′:7,8)-flavone (2), along with eight known flavonoids isolated for the first time from this plant, cynaroside (3), Apigetrin (4), centaureidin (5), oroxylin A (6), 5,7-dihydroxy-3′,4′,5′-trimethoxyflavone (7), atalantoflavone (8), 5-hydroxy-3′,4′,8-

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25

Possner, Sven T., Frank C. Schroeder, Hans Tore Rapp, Volker Sinnwell, Stefan Franke, and Wittko Francke. "3,7-Isoquinoline quinones from the ascidian tunicate Ascidia virginea." Zeitschrift für Naturforschung C 72, no. 7-8 (2017): 259–64. http://dx.doi.org/10.1515/znc-2017-0012.

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AbstractA new isoquinoline quinone system and its iodinated derivatives were isolated from the ascidian tunicateAscidia virgineaMüller 1776 (Phlebobranchia: Ascidiidae). Structures were elucidated by spectroscopic methods and derivatization reactions. Ascidine A (3,7-dihydro-1,8-dihydroxy-4-(4′-hydroxyphenyl)isoquinoline-3,7-dione (1), ascidine B (3,7-dihydro-1,8-dihydroxy-4-(4′-hydroxy-3′-iodophenyl)isoquinoline-3,7-dione (2), and ascidine C (3,7-dihydro-1,8-dihydroxy-4-(4′-hydroxy-3′,5′-diiodophenyl)isoquinoline-3,7-dione (3) represent a novel type of tyrosine-derived alkaloids.

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Schwikkard, Sianne, Hannah Whitmore, Timothy Corson, et al. "Antiangiogenic Activity and Cytotoxicity of Triterpenoids and Homoisoflavonoids from Massonia pustulata and Massonia bifolia." Planta Medica 84, no. 09/10 (2018): 638–44. http://dx.doi.org/10.1055/a-0577-5322.

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AbstractThe Hyacinthaceae family (sensu APGII), with approximately 900 species in around 70 genera, plays a significant role in traditional medicine in Africa as well as across Europe and the Middle and Far East. The dichloromethane extract of the bulbs of Massonia pustulata (Hyacinthaceae sensu APGII) yielded two known homoisoflavonoids, (R)-5-hydroxy-3-(4-hydroxybenzyl)-7-methoxy-4-chromanone 1 and 5-hydroxy-3-(4-hydroxybenzyl)-7-methoxy-4-chromone 2 and four spirocyclic nortriterpenoids, eucosterol 3, 28-hydroxyeucosterol 4 and two previously unreported triterpenoid derivatives, (17S,23S)-1

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27

Sheikh, Javed I., H. D. Juneja, and V. N. Ingle. "A Computational Approach towards the Development of Newer Anticancer Agents." E-Journal of Chemistry 7, no. 1 (2010): 21–24. http://dx.doi.org/10.1155/2010/582710.

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In silicomolecular docking analyses of the novel 1-(2', 4'-dihydroxy-5'-chlorophenyl)-3-aryl-propane-1, 3-diones were performed in the active sites of enzyme cytochrome P450 reductase to obtain new anticancer agents computationally. 1-(2', 4'-dihydroxy-5'-chlorophenyl)-3-(4"-methoxy-phenyl)-propane-1, 3-dione(3f)was found to have maximum affinity for the active sites of enzyme.

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Kisiel, Wanda, Anna Stojakowska, Franco Piozzi, and Sergio Rosselli. "Flavonoids from Teucrium fruticans L." Acta Societatis Botanicorum Poloniae 70, no. 3 (2014): 199–201. http://dx.doi.org/10.5586/asbp.2001.025.

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From aerial parts of <em>Teucrium fncticans</em> L. three flavonoids were isolated and identified as 5-hydroxy-6, 7, 3', 4'-tetramethoxyflavone, 5, 4'-dihydroxy-6, 7, 3'-trimethoxyflavone (cirsilineol) and 5, 4'-dihydroxy-6, 7-dimethoxyflavone (cirsimaritin). The former compound was found to be a predominant flavone aglycone constituent of the plant material. This is the first report on the isolation of flavonoids from the plant.

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Sugai, Takeshi, Kengo Hanaya, and Shuhei Higashibayashi. "Semisynthesis of prunetin, a bioactive O-methylated isoflavone from naringenin, by the sequential deacetylation of chalcone intermediates and oxidative rearrangement." Bioscience, Biotechnology, and Biochemistry 85, no. 1 (2021): 143–47. http://dx.doi.org/10.1093/bbb/zbaa021.

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Abstract Prunetin (4′,5-dihydroxy-7-methoxyisoflavone) was semisynthesized in 8 steps from readily available naringenin in 26% total yield. The key reaction was chemoenzymatic sequential deacetylation to 6′-acetoxy-2′,4″-dihydroxy-4′-methoxychalcone, the in situ-formed precursor for thallium(III) nitrate-mediated oxidative rearrangement.

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30

Amor, Evangeline C., Irene M. Villaseñor, Amsha Yasin, and M. Iqbal Choudhary. "Prolyl Endopeptidase Inhibitors from Syzygium samarangense (Blume) Merr. & L. M. Perry." Zeitschrift für Naturforschung C 59, no. 1-2 (2004): 86–92. http://dx.doi.org/10.1515/znc-2004-1-218.

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Compounds isolated from the hexane extract of the leaves of Syzygium samarangense (Blume) Merr. & L. M. Perry were tested for inhibitory activity against the following serine proteases: trypsin, thrombin and prolyl endopeptidase. The compounds were identified as an intractable mixture of α-carotene and β-carotene (1), lupeol (2), betulin (3), epi-betulinic acid (4), 2′,4′-dihydroxy-6′-methoxy-3′-methylchalcone (5), 2′-hydroxy-4′,6′-dimethoxy-3′- methylchalcone (6), 2′,4′-dihydroxy-6′-methoxy-3′,5v-dimethylchalcone (7), 2′,4′-dihydroxy- 6′-methoxy-3′-methyldihydrochalcone (8) and 7-hydroxy-

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31

Chang, Yu-Chia, Kuei-Hung Lai, Sunil Kumar, et al. "1H NMR-Based Isolation of Anti-Inflammatory 9,11-Secosteroids from the Octocoral Sinularia leptoclados." Marine Drugs 18, no. 5 (2020): 271. http://dx.doi.org/10.3390/md18050271.

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Octocoral Sinularia leptoclados has been identified as a source of bioactive 9,11-secosteroids. This study adopted a targeted isolation approach to the discovery and analysis of five 9,11-secosteroids, including two novel compounds named sinleptosterols A (1) and B (2) as well as five known analogues (8αH-3β,11-dihydroxy-24-methylene-9,11-secocholest-5-en-9-one (3), 8βH-3β,11-dihydroxy-24-methylene-9,11-secocholest-5-en-9-one (4), leptosterol A (5), (24S)-3β,11-dihydroxy-24-methyl-9,11-secocholest-5-en-9-one (6), and 3β,11-dihydroxy-9,11-secogorgost-5-en-9-one (7)) in terms of 1H-NMR patterns

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32

Elix, JA, KL Gaul, PW James, and OW Purvis. "Three New Lichen Depsidones." Australian Journal of Chemistry 40, no. 2 (1987): 417. http://dx.doi.org/10.1071/ch9870417.

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The depsidones α- acetylconstictic acid (5-acetoxymethyl-1,4-dihydroxy-10-methoxy-8-methyl-3,7-dioxo-1,3-dihydro-7 H- isobenzofuro [4,5- b][l,4] benzodioxepin-ll-carbaldehyde ) (6), substictic acid (1,4-dihydroxy-10-methoxy-8-methy1-3,7-dioxo- 1,3-dihydro-7 H- isobenzofuro [4,5-b][1,4]benzodioxepin-11-carbaldehyde) (7) and conphysodalic acid (9-acetoxymethyl-3,8-dihydroxy-4-hydroxymethyl-1,6-dimethyl-11-oxo-11 H- dibenzo [ b,e ][l,4]dioxepin-7-carboxylic acid) (12) have been identified in lichens and characterized.

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33

Geng, Di, Xuan Ma, Lianjin Weng, Litao Yi, Yuanyuan Han, and Xin Yang. "A New Acetophenone Trimer From Roots of Euphorbia ebracteolata." Open Chemical Engineering Journal 9, no. 1 (2015): 67–70. http://dx.doi.org/10.2174/1874123101509010067.

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A new acetophenone trimer, named ebracteolatain C, along with two known diterpenoids was isolated from Euphorbia ebtacteolata. The structure of the compound 1 was elucidated as 1-[3, 5-bis-(3-acetyl-2, 6-dihydroxy-4- methoxy-benzyl)-4, 6-dihydroxy-2-methoxy-phenyl]-ethanone on basis of spectroscopic methods.

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34

Ngamga, Dieudonne, Josephine Bipa, Pearl Lebatha, et al. "Isoquinoline Alkaloids and Homoisoflavonoids from Drimiopsis barteri Bak and D. burkei Bak." Natural Product Communications 3, no. 5 (2008): 1934578X0800300. http://dx.doi.org/10.1177/1934578x0800300518.

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The powdered bulbs and leaves of Drimiopsis barteri yielded two novel isoquinoline alkaloids: 5-hydroxy-7,2′,3′,4′-tetramethoxy{2H-1-}benzopyran [4,3-c]isoquinoline and 6-hydroxy-7,2′,3′,4′-tetramethoxy{2H-1-}benzopyran [4,3-c]isoquinoline, three new scillascillins: 5,7-dihydroxy-2′,3′,4′-trimethoxyspiro-{2H-1-benzopyran-7′-bicyclo [4.2.0]octa[1,3,5]-triene}-4-one, 5-hydroxy-7,2′,3′,4′-tetramethoxyspiro{2H-1-benzopyran-7′-bicyclo [4.2.0]octa[1,3,5]-triene}-4-one and 5,2′,4′-trihydroxy-7,3′-dimethoxyspiro{2H-1-benzopyran-7′-bicyclo [4.2.0]octa[1,3,5]-triene}-4-one, and a tetrahydroxyhomo-isofla

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35

V., R. VENKATARAMA, KATHER M.S., MANSOOR I., and NAGARAJAN S. "Nlckel(II) and Copper(II) Complexes with 2',4'-Dihydroxy-5'-(4-methoxy)cinnamoyl-4-methoxychalcone." Journal of Indian Chemical Society Vol. 63, Oct 1986 (1986): 925–26. https://doi.org/10.5281/zenodo.6297236.

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P. <em>G. </em>Department of Chemistry, Jamal Mohamed College, Tiruchirapalli-620 020 Department of Chemistry, Bharathidasan University, Tiruchirapalli-620 028 <em>Manuscript received 22 March 1985, revised 10 July 1986,accepted 23 August 2986</em> Nlckel(II) and Copper(II) Complexes with 2',4'-Dihydroxy-5'-(4-methoxy)cinnamoyl-4-methoxychalcone.

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36

De Melo, Loretta Ennes Sabóia, Jhonis Bentes Silva, Claudete Catanhede Do Nascimento, Antonio Gilberto Ferreira, and Maria da Paz Lima. "Identification of phenolic compounds and their relationship to the natural resistance of wood from Dipteryx polyphylla Huber and Acacia mangium Willd." International Journal for Innovation Education and Research 8, no. 12 (2020): 471–80. http://dx.doi.org/10.31686/ijier.vol8.iss12.2860.

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Flavonoids are the phenolic compounds that are predominant in the Fabaceae family, and isoflavonoids are especially recognized for their contribution to the natural resistance of wood from species of this family. Herein, we investigated the phenolic compounds from extracts of wood residues from the Fabaceae species Dipteryx polyphylla Huber and Acacia mangium Willd. A phytochemical study of D. polyphylla led to isolation and identification of isoflavans such as 3’,7-dihydroxy-4'-methoxy-isoflavan (1), 2’,8-dihydroxy-4’,7-dimethoxy-isoflavan (2), 2’,7-dihydroxy-4’-methoxyisoflavan (3) and 3’,8-

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37

KUMAR, N., S. ROY, V. S. PARMAR, and W. ERRINGTON. "ChemInform Abstract: 2′,4′-Dihydroxy-2-[3-(4-methylphenyl)isoxazol-5-yl]acetophenone." ChemInform 29, no. 48 (2010): no. http://dx.doi.org/10.1002/chin.199848018.

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38

Li, Ming Hua, Guang Ting Han, Hao Chen, Jian Yong Yu, and Yuan Ming Zhang. "Study on the Chemical Constituents of Apocynum venetum Bark." Advanced Materials Research 284-286 (July 2011): 2119–22. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.2119.

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The alcoholic extract of the Apocynum venentum (AV)bark were purified by silica gel column chromatography. The isolated chemical constituents were identified by MS, NMR, IR spectra. The main chemicals isolated from AV bark were quercetin (1), kaempferol (2), isoquercitrin (3), luteolin (4), hyperoside(5), 7-hydroxy-6-methoxy-2H-1-benzopyran-2-one (6), b-sitosterol (7), stigmasterol (8), 3, 4-dihydroxy-benzoic acid methyl ester (9), 3, 5-dihydroxybenzaldehyde (10) and 3, 4-dihydroxy-benzoic acid (11). The compounds (1)～(6) and (8)～(11) were obtained from AV bark for the first time.

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39

Geng, Di, Lian Jin Weng, Yuan Yuan Han, and Xin Yang. "Chemical Constituents from Euphorbia helioscopia." Advanced Materials Research 396-398 (November 2011): 1337–40. http://dx.doi.org/10.4028/www.scientific.net/amr.396-398.1337.

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AIM: To study the chemical constituents of Euphorbia helioscopia. METHODS: Compounds 1-10 were isolated and purified by silica gel, Sephadex LH-20 and Rp-18 chromatogarphy. Their structures were elucidated mainly by spectroscopic methods. RESULTS: Ten known compounds, helioscopinolide A(1), helioscopinolide B(2), scopoletin(3), scoparone(4), isoscopoletin(5), licochalone A(6), quercelin(7), 7, 4’-dihydroxy-5-methoxy flacanone(8), 2’, 4’-dihydroxy-6’-methoxydihydrochalcone(9) and pinocembrin(10), were isolated and structurally elucidated. CONCLUSION: Compound 3-5 and 8-10 were isolated from thi

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40

Indrasari, Tika, Rina Herowati, and Nuraini Harmastuti. "Studi Biokemoinformatika Metabolit Daun Kersen (Muntingia calabura L.) sebagai Agen Kanker Kolorektal." PHARMACY: Jurnal Farmasi Indonesia (Pharmaceutical Journal of Indonesia) 19, no. 2 (2022): 251. http://dx.doi.org/10.30595/pharmacy.v19i2.13289.

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Salah satu tanaman yang dapat digunakan sebagai anti kanker adalah daun kersen. Beberapa penelitian menunjukkan bahwa daun kersen bermanfaat untuk antioksidan, antikanker, anti inflamasi, dan anti bakteri. Penelitian bertujuan untuk mengetahui senyawa terbaik yang dapat berikatan dengan target terbaik dari kanker kolorektal dan untuk mengetahui prediksi profil farmakokinetik serta profil toksisitas kandungan senyawa daun kersen. Makromolekul yang digunakan adalah target molekuler kanker kolorektal yang diperoleh berdasarkan skrining awal menggunakan prediksi SwissPred, SuperPred dan Seasearch

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41

Ma, Qinge, Rongrui Wei, and Zhipei Sang. "Structural Characterization and Hepatoprotective Activity of Naphthoquinone From Cucumis bisexualis." Natural Product Communications 15, no. 1 (2020): 1934578X2090289. http://dx.doi.org/10.1177/1934578x20902898.

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Three new naphthoquinones, namely 5,8-dihydroxy-7′-isopropyl-furan ring-1″-prenyl-naphthoquinone (1), 5,8-dihydroxy-7′-propenyl-furan ring-1″-isopropanol-naphthoquinone (2), and 5,8-dihydroxy-7′-isopropanol-furan ring-1″-(5″-hydroxyphenyl)-naphthoquinone (3), along with 10 known naphthoquinone derivatives (4-13) were isolated from Cucumis bisexualis for the first time. All the compounds were elucidated on the basis of spectroscopic data analysis and chemical evidence. Compounds (1-13) were evaluated for their hepatoprotective activites on human L-O2 cells. Among them, compounds 1, 4, and 8 exh

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42

Hoi, Tran Minh, Tran Van Thai, Chu Thi Thu Ha, Ha Thi Van Anh, Phan Xuan Binh Minh, and Nguyen Tien Dat. "Flavonoids from Anoectochilus annamensis and their Anti-inflammatory Activity." Natural Product Communications 11, no. 5 (2016): 1934578X1601100. http://dx.doi.org/10.1177/1934578x1601100514.

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One new flavonol diglycoside, 4′,5-dihydroxy-3,3′,7-trimethoxyflavone 4′- O-α-L-rhamnopyranosyl-(1→6)-β-D-glucopyranoside (1), and two known compounds (2–3) were isolated from the methanol extract of Anoectochilus annamensis Aver. aerial parts. The effects were evaluated of all isolated compounds (1–3) on LPS-induced production of the inflammatory mediator nitric oxide (NO) by RAW264.7 cells. 4′,5-Dihydroxy-3,3′,7-trimethoxyflavone (2) was the most active while the addition of a rutinoside at C-4′ (compound 1) decreased the inhibitory activity. This is the first report on the chemical composit

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43

Luo, Yong Ming, Yong Dong Luo, Fang You Chen, Hua Liu, and Jian Jiang Fu. "Studies on the Chemical Constituents of Chloranthus henryi." Advanced Materials Research 1033-1034 (October 2014): 279–82. http://dx.doi.org/10.4028/www.scientific.net/amr.1033-1034.279.

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FromChloranthushenryi,ten compounds were isolated and identified as 1β,8β-Dihydroxy-eudesman 4(15),7(11)-dien8α,12-olide (1), 4β,8β-dihydroxy-5α (H)- eudesm-7(11) -en-8,12-olide (2), 12-oxo-15-hydroxylabda-8(17), 13E-dien-19-oic acid (3), 12(S), 15-dihydroxy labda - 8(17),13E-dien-19-oic acid (4) , curcolonol (5), flavokawain A (6), 2 ́-hydroxy-4, 3 ́, 4 ́, 6 ́– tetramethoxychalcone (7), daucosterol (8), β-sitosterol (9) and 3,4-dihydroxybenzoic acid (10). The structures of the isolated compounds were established by means of NMR and MS analyses. These compounds were firstly isolated from this

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44

SUNIL, K. TALAPATRA, K. PAL MILAN, K. MALLIK ASOK та TALAPATRA BANI. "Chemical Constituents of Eupαtorium erythropαppum : Eupathronoside-A New Flavanone Glucoside and (- )-1S,2R,4S,5R-2,5-Dihydroxy-p-menthane- A New Monoterpene Diol". Journal of Indian Chemical Society Vol. 62, Dec 1985 (1985): 999–1002. https://doi.org/10.5281/zenodo.6325330.

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Department of Chemistry, University College of Science, University of Calcutta, Calcutta-700 009 A new flavanone glucoside designated as eupathronoside (1) and a new monoterpene diol shown to be (—)-1S, 2R, 4S, 5R-2,5-dihydroxy-<em>p</em>-menthane (3) have been isolated from the whole plant of <em>Eupαtorium erythropαppum</em><em> </em>Robinson along with kaempferyl 5-methyl ether (4), (+)-3S,4S,6R-3,6-dihydroxy-<em>p</em>-menth-1-ene (5), physcion (6), coumarin, methyl <em>p</em>-coumarate and <em>β</em>-sitosterol. Eupathronoside has the structure as 3,4'-dihy

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45

Ganapaty, Seru, Vimal Nair, Devarakonda Rama Devi, Steve Thomas Pannakal, Hartmut Laatsch, and Birger Dittrich. "Rare Prenylated Isoflavones from Tephrosia calophylla." Natural Product Communications 9, no. 7 (2014): 1934578X1400900. http://dx.doi.org/10.1177/1934578x1400900713.

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Chemical re-examination of the roots of T. calophylla led to the isolation of four isoflavones, namely 2′,4′,5-trihydroxy-6,7-(2″,2″-dimethylchromene)-8-γ,γ-dimethylallylisoflavone (1a, auriculatin), 2′,5-dihydroxy-6,7-(2″,2″-dimethylchromene)-4′-γ,γ-dimethylallyloxyisoflavone (2a, isoauriculatin), 3′,4′,5-trihy-droxy-6,7-(2″,2″-dimethylchromene)-8-γ,γ-dimethylallylisoflavone (1b, auriculasin), and 3′,5-dihydroxy-6,7-(2″,2″-dimethylchromene)-4′-γ,γ-dimethylallyl-oxyisoflavone (2b, isoauriculasin). Auriculasin and isoauriculasin are reported for the first time with full NMR assignments. All met

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46

Kolkmann, Rainer, and Eckhard Leistner. "4-(2′-Carboxyphenyl)-4-oxobutyryl Coenzyme A Ester, an Intermediate in Vitamin K2 (Menaquinone) Biosynthesis." Zeitschrift für Naturforschung C 42, no. 11-12 (1987): 1207–14. http://dx.doi.org/10.1515/znc-1987-11-1212.

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Enzyme preparations from Mycobacterium phlei, Escherichia coli and Galium mollugo cell suspension cultures were incubated in the presence of 4-(2′-carboxyphenyl)-4-oxobutyrate (i.e. o- succinylbenzoic acid. OSB. 1). ATP. coenzyme A and Mg2+. The main product isolated from the incubation mixture was 4-(2′-carboxyphenyl)-4-oxobutyryl coenzyme A ester (2) as determined by comparison with synthetic coenzyme A esters. Synthetic and enzymically formed 4-(2′-car-boxyphenyl)-4-oxobutyryl coenzyme A ester (2) was shown to be enzymically converted to an intermediate in vitamin K2 biosynthesis viz. 1.4-d

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47

Elix, JA, JA Elix, L. Lajide, L. Lajide, JH Wardlaw, and JH Wardlaw. "The Structure of Echinocarpic Acid. A Benzyl Ester From the Lichen Parmelia norcrambidiocarpa." Australian Journal of Chemistry 48, no. 6 (1995): 1213. http://dx.doi.org/10.1071/ch9951213.

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The benzyl ester echinocarpic acid (1′,4′-dihydroxy-6'-methoxy-3′-oxo-1′,3′-dihydroisobenzo-furan-5′-ylmethyl 2,4-dihydroxy-3,6-dimethylbenzoate) (7) has been isolated from the lichen Parmelia norcrambidiocarpa together with atranorin and chloroatranorin. The structure of the compound (7) followed from a combination of spectroscopic and chemical data.

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48

Budzianowski, Jaromir, and Eckhard Wollenweber. "Rare Flavones from the Glandular Leaf Exudate of the Oxlip, Primula Elatior L." Natural Product Communications 2, no. 3 (2007): 1934578X0700200. http://dx.doi.org/10.1177/1934578x0700200308.

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5,6,2′,3′,6′-Pentamethoxyflavone (1), together with 3′,5′-dihydroxy-4′-methoxyflavone (2), 2′-methoxyflavone, 3′-methoxyflavone, 3′,4′-dimethoxyflavone, 2′,5′-methoxyflavone, 3′-hydroxy-4′,5′-dimethoxyflavone, 3′,4′,5′-trimethoxyflavone, and 3′-hydroxy-4′,5′-methylenedioxyflavone were found in the leaf exudate of the oxlip, Primula elatior (Primulaceae). The structures of flavones 1 and 2 were substantiated by 2D NMR spectroscopy.

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49

Alves, José C. F. "Study of Catalytic Hydrogenation and Methanol Addition to α-Methylene-γ-Lactone of Eremanthine Derivatives". Organic Chemistry International 2010 (19 грудня 2010): 1–11. http://dx.doi.org/10.1155/2010/603436.

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The sesquiterpene lactones guaia-1(10),11(13)-dieno-4α-hydroxy,9α-acetyl-15-iodine-12,6α-lactone (2), guaia-1(10),4(15),11(13)-trieno-9α-hydroxy-12,6α-lactone (3), (11S)-guaia-4(15),10(14)-dieno-9α-hydroxy-13-methoxy-12,6α-lactone (4), (11S)-guai-1(10)-eno-4α,9α-dihydroxy-13-methoxy-12,6α-lactone (5), and guaia-1(10),11(13)-dieno-4α,9α-dihydroxy-15-iodine-12,6α-lactone (6) were previously obtained starting from the natural product eremanthine (1). In this paper we report the catalytic hydrogenation reactions of allylic derivatives 2–5 and the methanol addition to α-methylene-γ-lactone of the i

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50

Sharma, Sunil, and Nitin Singh. "Vibrational Spectral Studies and Thermodynamic Functions of Solid 2, 4-Dihydroxy-5-Fluro Pyrimidine." International Journal of Science and Research (IJSR) 10, no. 6 (2021): 898–904. https://doi.org/10.21275/sr21613103213.

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