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Journal articles on the topic '6-hydroxy-7'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

HARA, HIROSHI, TOSHIFUMI AKIBA, TAKANORI MIYASHITA, OSAMU HOSINO, and BUNSUKE UMEZAWA. "Studies on tetrahydroisoquinolines. XXXII. Conversion of 7-hydroxy-6-methoxytetrahydroisoquinolines to 6-hydroxy-7-methoxytetrahydroisoquinolines." CHEMICAL & PHARMACEUTICAL BULLETIN 36, no. 9 (1988): 3638–41. http://dx.doi.org/10.1248/cpb.36.3638.

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2

Chen, Zhengming, and Peter C. Meltzer. "Synthesis of 6- or 7- hydroxy and 6- or 7- methoxy tropanes." Tetrahedron Letters 38, no. 7 (1997): 1121–24. http://dx.doi.org/10.1016/s0040-4039(97)00087-7.

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3

Shit, Ranjt Kumar, and Nitai Chand Sinha. "High degree of regioselectivity during the synthesis of new allylcoumarins employing thermal Claisen rearrangement." INDIAN JOURNAL OF HETEROCYCLIC CHEMISTRY 34, no. 03 (2024): 431. http://dx.doi.org/10.59467/ijhc.2024.34.431.

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Allyloxycoumarins (3,4) and ethyl 2-allyloxycinnamates (27, 28) were converted into 7-hydroxy-8- allylcoumarins (5,6), 2-hydroxy-3-allyl-4-methoxy-E-cinnamate ester (29), and 2-hydroxy-3-acetyl-4-methoxy-5-allyl cinnamate ester (30) by thermal Claisen rearrangement. The compounds 7-hydroxy-8-allylcoumarins (5,6) and 2-hydroxy-3- allyl cinnamate (30) on acylation or benzoylation, followed by Fries rearrangement gave 6-acetyl-7-hydroxy-8-allylcoumarins (15-20), 6-benzoyl-7-hydroxy-8-allylcoumarins (21,22), and 2-hydroxy-3-allyl-4-methoxy-5-acetylcoumarin (31). The compounds (33) and (30) underwe

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4

Shokol, Т., N. Gorbulenko, and V. Khilya. "SYNTHESIS OF 7-HYDROXY-2,8-DIMETHYL-4-OXO-3-PHENOXY-4H-6-CHROMENECARBALDEHYDE." Bulletin of Taras Shevchenko National University of Kyiv. Chemistry, no. 1(55) (2018): 54–57. http://dx.doi.org/10.17721/1728-2209.2018.1(55).13.

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Ortho-hydroxyformylchromones are convenient syntones for the construction of linear and angular hetarenochromones. Usually, 7-hydroxy-6-formylchromones were synthesized by oxidation of natural linear furochromones: visnagin and kellin and their synthetic analogues. The Duff reaction, which is the formylation of phenols in the ortho-position by heating with hexamethylenetetramine followed by acidic hydrolysis of intermediate imine, was also used to convert 7-hydroxychromones into 7-hydroxy-6-formylchromones, but in this case there were some difficulties because of the passivity of position 6 in

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5

Rashid, Mohammad A., James A. Armstrong, Alexander I. Gray, and Peter G. Waterman. "Novel C-Geranyl 7-Hydroxycoumarins from the Aerial Parts of Eriostemon tomentellus." Zeitschrift für Naturforschung B 47, no. 2 (1992): 284–87. http://dx.doi.org/10.1515/znb-1992-0221.

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From the aerial parts of Eriostemon tomentellus five coumarins have been isolated. These have been characterized as ostruthin (6-geranyl-7-hydroxycoumarin (1)) and the novel compounds, 8-geranyl-7-hydroxycoumarin (2), (E)-6-(7-hydroxy-3,7-dimethylocta-2,5-dienyl)- 7-hydroxycoumarin (3), (E)-6-(7-hydroperoxy-3,7-dimethylocta-2,5-dienyl)-7-hydroxycoumarin (4), and 6-(6-hydroxy-3,7-dimethylocta-2,7-dienyl)-7-hydroxycoumarin (5). In addition tembamide (2-{4-methoxyphenyl}-2-hydroxy-N-benzoylethylamine (6 ) was isolated and the l3C NMR spectrum reported for the first time.

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6

Beh, Hooi-Kheng, Zhari Ismail, Mohd Zaini Asmawi, Wan-Sin Loh, and Hoong-Kun Fun. "7-Hydroxy-6-methoxy-2H-chromen-2-one." Acta Crystallographica Section E Structure Reports Online 66, no. 8 (2010): o2138. http://dx.doi.org/10.1107/s1600536810029296.

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7

Wittman, Mark D., Thomas J. Alstadt, John F. Kadow, et al. "Stereospecific synthesis of 7-deoxy-6-hydroxy paclitaxel." Tetrahedron Letters 40, no. 27 (1999): 4943–46. http://dx.doi.org/10.1016/s0040-4039(99)00864-3.

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8

Hari, Kant, and Singh Khirwar Mahesh. "Isolation and Characterisation of Coumarin Derivative from Sida rhombifolia Linn." Pharmaceutical and Chemical Journal 9, no. 2 (2022): 30–32. https://doi.org/10.5281/zenodo.13970451.

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A novel coumarin derivative has been isolated from the dichloromethylene fraction of the aerial part of the <em>Sida rhombifolia</em>. The structure of the isolated compound has been established as 7-hydroxy-6-methoxy coumarin based on the spectral (UV, IR, <sup>1</sup>HNMR, <sup>13</sup>CNMR, mass) data.  

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9

CHEN, Z., and P. C. MELTZER. "ChemInform Abstract: Synthesis of 6- or 7-Hydroxy and 6- or 7-Methoxy Tropanes." ChemInform 28, no. 23 (2010): no. http://dx.doi.org/10.1002/chin.199723179.

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10

Lischewski, Manfred. "Partialsynthese von 6-Oxo- und 6-Hydroxy-7-nor-gibberellin A3." Zeitschrift für Chemie 28, no. 4 (2010): 143–44. http://dx.doi.org/10.1002/zfch.19880280407.

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11

Dutta, Lakshmi Narayan, Banani De, Godhuli Pal, and Amarendra Patra. "Feasibility of sigmatropic rearrangement on electron-deficient coumarinyl ketones." Canadian Journal of Chemistry 86, no. 5 (2008): 401–9. http://dx.doi.org/10.1139/v08-037.

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Different alkyl/aryl 7-hydroxy-8-coumarinyl ketones were converted to 7-O-allyl and 7-O-cyclohexenyl ethers and the study of hitherto unreported sigmatropic rearrangement on 7-O-allyl and 7-O-cyclohex-2'-ene-1'-ylcoumarinyl ketones prepared is accounted herein. The rearrangement yielded alkyl/aryl 6-allyl-7-hydroxy-8-coumarinyl ketones 3 and alkyl/aryl 6-cyclohex-2'-en-1'-yl-7-hydroxy-8-coumarinyl ketones 7 as the major products. Interestingly, unusual selectivity was observed in the case of alkyl 7-O-allylcoumarinyl ketones. Thus alkyl 3-allyl-7-hydroxy-8-coumarinyl ketones 4 and alkyl 8-ally

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12

Journal, Baghdad Science. "Synthesis & Characterization of Oxazinan and 5-oxa-7-aza-spiro[2,5] octane from reaction of Dibenzylidene with malonic anhydride and 5-oxa-spiro[2,3] hexane-4,6-dione." Baghdad Science Journal 4, no. 2 (2007): 276–84. http://dx.doi.org/10.21123/bsj.4.2.276-284.

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Di Benzylidenes were prepared by condensation of 1,2-diamino benzene with o- hydroxy benzaldehyde. These dibenzylidenes when treated with one equivalent of malonic anhydride or 5-oxo-spiro[2,3]hexane-4,6-dione in dry benzene give 6-membered heterocyclic ring system of 3-{2-[(2-Hydroxy-benzylidene)-amino]-phenyl}-2-(2-hydroxy –phenyl)-[1,3]oxazinane-4,6-diones ( 1-3) or 7-{2-[(2-hydroxy-benzylidene)-amino]-phenyl}-6-(2-hydroxy-phenyl)-5-oxa-7-aza-spiro[2.5]octane-4,8-diones ( 7- 9 ) But when two equivalents of malonic anhydride or 5-oxo-spiro[2,3]hexane-4,6-dione were used and under sam conditi

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13

Wallet, J. C., E. M. Gaydou, E. Espinosa, O. Osorno, E. Molins, and C. Miravitlles. "Structure of 2-(2,6-dimethoxyphenyl)-7-hydroxy-4H-1-benzopyran-4-one (7-hydroxy-2',6'-dimethoxyflavone)." Acta Crystallographica Section C Crystal Structure Communications 48, no. 1 (1992): 86–88. http://dx.doi.org/10.1107/s0108270191006285.

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14

Kraut, L., B. Scherer, R. Mues, and M. Sim-Sim. "Flavonoids from Some Frullania Species (Hepaticae)." Zeitschrift für Naturforschung C 50, no. 5-6 (1995): 345–52. http://dx.doi.org/10.1515/znc-1995-5-603.

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Abstract From Frullania teneriffae 5 known flavone aglycones and 6 flavone glycosides were isolated, among them the new 6-OH-luteolin-6-O-β-ᴅ-glucoside-7-O-β-ᴅ-glucoside-6′′′-(3-hydroxy-3-methylglutaroylester). F. cesatiana contains 2 flavone-di-C-glucosides and the new 6-OH-luteolin-7-O-β-ᴅ-glucoside-6′′-(3-hydroxy-3-methylglutaroylester)-3′-O-glucuronide.The phenolic pattern of F. eboracensis was compared to that of F. muscicola. The known 6-OH-luteolin-7-O-β-ᴅ-glucoside-6′′-(3-hydroxy-3-methylglutaroylester) was identified from F. gibbosa and F. arecae.

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15

Martinet, Silvio J., Lesley Larsen, Jonathan D. Street, and John A. Joule. "Synthesis of 6-hydroxy-1,4-dimethylisoquinoline and of ethyl 7-hydroxy-6-methoxy-1-methylisoquinoline-3-carboxylate." Journal of the Chemical Society, Perkin Transactions 1, no. 7 (1988): 1705. http://dx.doi.org/10.1039/p19880001705.

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16

Amorim, Magali S., Alessandra F. Serain, Marcos José Salvador, and Maria Élida A. Stefanello. "Chemical Constituents of Sinningia hatschbachii." Natural Product Communications 12, no. 11 (2017): 1934578X1701201. http://dx.doi.org/10.1177/1934578x1701201128.

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A new naphthoquinone, 6-hydroxy-7-methoxy-2- O-methylduniol (1), was isolated from the tubers of Sinningia hatschbachii Chautems (Gesneriaceae), together with 10 known compounds: 7-hydroxy-α-dunnione, 7-hydroxy-6-methoxy-α-dunnione, 2,4,4’,6-tetramethoxydihydrochalcone, 4’-hydroxy-2,4,6-trimethoxydihydrochalcone, 4’,2-dihydroxy-4,6-dimethoxydihydrochalcone, methyl 1-hydroxy-4-methoxy-2-naphthoate, methyl 1,4-dimethoxy-2-naphthoate, methyl 4-hydroxybenzoate, calceolarioside B, and conandroside. All compounds were identified by spectroscopic techniques, and comparison with literature. Extracts i

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17

Elix, JA, UA Jenie, and GA Jenkins. "Three New Depsidones From the Lichen Neofuscelia subincerta." Australian Journal of Chemistry 40, no. 12 (1987): 2031. http://dx.doi.org/10.1071/ch9872031.

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The depsidones , glomelliferonic acid (4)(8-hydroxy-3-methoxy-ll-oxo-l-(2-oxopentyl)-6- pentyl -11H-dibenzo[ b,e ] [1,4]dioxepin-7-carboxylic acid), loxodellonic acid (5) (8-hydroxy-3-methoxy-11-oxo-1-(2-oxopenty1)-6-propyl-llH-dibenzo[ b,e ][l,4]dioxepin-7-carboxylic acid) and glomellonic acid (6) (8-hydroxy-3-methoxy-1l-oxo-l,6-di(2-oxopentyl)-11H- dibenzo [ b,e ][l,4]dioxepin-7-carboxylic acid), have been isolated from the lichen Neofuscelia subincerta ( Essl .) Essl . and characterized.

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18

Elix, JA, JA Elix, DA Venables, DA Venables, M. Wedin, and M. Wedin. "New Dibenzofurans and Depsides From the Lichen Bunodophoron patagonicum." Australian Journal of Chemistry 47, no. 7 (1994): 1335. http://dx.doi.org/10.1071/ch9941335.

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The lichen Bunodophoron patagonicum has been shown to contain five new dibenzo -furans: ascomatic acid (3,7-dimethoxy-1,9-dimethyldibenzofuran-2-carboxylic acid) (2) and the corresponding methyl ester (3); 7-O-methylnorascomatic acid (3-hydroxy-7-methoxy-1,9-dimethyldibenzofuran-2-carboxylic acid) (4) and the corresponding methyl ester (5); and norascomatic acid (3,7-dihydroxy-1,9-dimethyldibenzofuran-2-carboxylic acid) (6). The lichen also contains two new depsides : patagonic acid [2-hydroxy-4-(2′-hydroxy-4′-methoxy-6′-methyl-benzoyloxy)-6-(2′-oxononyl)benzoic acid] (10) and isopatagonic aci

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19

Backer, H. J., and A. C. Houtman. "La 2-Amino-4-Hydroxy-7(6?)-Hydroxyméthyl-Ptéridine." Recueil des Travaux Chimiques des Pays-Bas 67, no. 4 (2010): 260–64. http://dx.doi.org/10.1002/recl.19480670402.

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20

SHAFIULLAH, A. ANSARI JAVED, and A. ANSARI SHAHID. "Lithium Aluminium Hydride Reduction of Nitrosteroids." Journal of Indian Chemical Society Vol. 65, Apr 1988 (1988): 269–70. https://doi.org/10.5281/zenodo.6035269.

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Steroid Research Laboratory, Department of Chemistry, Aligarh Muslim University, Aligarh-202 002<strong> </strong> <em>Manuscript received 21 December 1987, accepted 27 January 1988</em> The reaction of 3<em>β</em>-acetoxy-6-nitro-7α-bromocholest-5-ene (1) with lithium aluminium hydride gave 6-nitrocholest-3,5-diene (2), 3<em>β</em>-acetoxy-5α-cholestan-6-one oxime (3), 3<em>β</em> hydroxy-6β-nitrocholest-4-ene (4), 3<em>β</em>-hydroxy-6<em>β</em>-nitro-7α-bromocholest4-ene (5), 3<em>β</em>-hydroxy-6-nitroeholest-5-ene (6) and 3β-h

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21

Shokol, Tatyana, Natalia Gorbulenko, and Khilya Volodymyr. "Synthesis of linear hetarenochromones based on 7-hydroxy-6-formyl(acetyl)chromones." French-Ukrainian Journal of Chemistry 9, no. 1 (2021): 70–96. http://dx.doi.org/10.17721/fujcv9i1p70-96.

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Fused chromones are attracting increasing attention as novel therapeutic agents due to their wide distribution in nature, effective bioactivities and low toxicity. 6-Carbonyl-7-hydroxychromones proved to be versatile synthons for the synthesis of linear hetarenochromones by annulation of heterocycle to the chromone core. The present review is focused on the syntheses of furo[3,2-g]chromones, pyrano[3,2-g]chromones and some of their N-containing analogues, namely chromeno[6,7-d]isoxazoles, pyrano[3’,2’:6,7]chromeno[4,3-b]pyridine-5,11-diones and pyrano[3’,2’:6,7]chromeno[4,3-c]pyridine-5,11-dio

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22

Farooq, M. O., and S. M. Osman. "Studies on the oxidation of isomeric 6-octadecenoic acids. Characterisation of 6(7)-hydroxy-7(6) ketostearic acids." Recueil des Travaux Chimiques des Pays-Bas 78, no. 11 (2010): 864–71. http://dx.doi.org/10.1002/recl.19590781103.

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23

Dikusar, E. A., E. A. Akishina, N. A. Zhukovskaya, et al. "Synthesis of Formylphenyl 1-Oxo-1,2,3,6,7,7a-hexahydro-3a,6-epoxyisoindole-7-carboxylates and Their (E)-1,5-Dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazole-4-yliminomethyl Derivatives." Žurnal obŝej himii 94, no. 7 (2024): 786–804. https://doi.org/10.31857/s0044460x24070016.

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Formylphenyloxohydroepoxyisoindole carboxylates were prepared by the reaction of 4-hydroxy-3-methoxy-, 4-hydroxy-3-ethoxy- and 3-hydroxy-4-methoxybenzaldehydes with substituted isoindolecarboxylic acids {2-methyl-1-oxo-1,2,3,6,7,7a-hexahydro-3a,6-epoxyisoindole-7-carboxylic, 2-(3,4-dimethoxyphenethyl)1-oxo-1,2,3,6,7,7a-hexahydro-3a,6-epoxyisoindole-7-carboxylic, 2-(benzo[d][1,3]dioxol-5-ylmethyl)-1-oxo1,2,3,6,7,7a-hexahydro-3a,6-epoxyisoindole-7-carboxylic, 6-oxo-3,4,6,6a,7,8-hexahydro-2H,10bH-8,10a-epoxy[1,3]oxazino[2,3-a]isoindole-7-carboxylic, 2-(2,3-dichlorobenzyl)-1-oxo-1,2,3,6,7,7a-hexah

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24

Rodrigo, Mellisa. "Compounds 7-Hydroxy-6-Metoxic Cytotoxic Cytotoxic Stem Leather From Chisochetonmacrophyllus (Meliaceae) Bark." International Journal of Science and Society 2, no. 2 (2020): 363–67. http://dx.doi.org/10.54783/ijsoc.v2i2.180.

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A phenyl propanoid compound, 7-hydroxy-6-methoxycoumarin has been isolated from the bark of Chisocheton macrophyllus (Meliaceae). The chemical structure of isolated compound was identified on the basis of spectroscopic data including UV, IR, 1D-NMR, 2D-NMR and mass along with comparison with those spectral data previously reported. 7-hydroxy-6-methoxycoumarin compound showed cytotoxic effect against P-388 murine leukemia cell with IC50 value of 16.5 mg/mL. 7-hydroxy-6-methoxycoumarin compound was reported for the first time from genus of Chisocheton.

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25

Rodrigo, Mellisa. "Compounds 7-Hydroxy-6-Metoxic Cytotoxic Cytotoxic Stem Leather From Chisochetonmacrophyllus (Meliaceae) Bark." International Journal of Science and Society 2, no. 2 (2020): 363–67. http://dx.doi.org/10.54783/ijsoc.v2i2.180.

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A phenyl propanoid compound, 7-hydroxy-6-methoxycoumarin has been isolated from the bark of Chisocheton macrophyllus (Meliaceae). The chemical structure of isolated compound was identified on the basis of spectroscopic data including UV, IR, 1D-NMR, 2D-NMR and mass along with comparison with those spectral data previously reported. 7-hydroxy-6-methoxycoumarin compound showed cytotoxic effect against P-388 murine leukemia cell with IC50 value of 16.5 mg/mL. 7-hydroxy-6-methoxycoumarin compound was reported for the first time from genus of Chisocheton.

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26

Hřebabecký, Hubert, Martin Dračínský, Armando M. De Palma, Johan Neyts, and Antonín Holý. "Synthesis of novel carbocyclic nucleoside analogues derived from 7-oxabicyclo[2.2.1]heptane-2-methanol." Collection of Czechoslovak Chemical Communications 74, no. 3 (2009): 487–502. http://dx.doi.org/10.1135/cccc2008204.

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Hydroboration of [(1R*,2R*,4R*)-7-oxabicyclo[2.2.1]hept-5-en-2-yl]methyl benzoate (5), which was prepared by Diels–Alder reaction of furan with acrolein and subsequent reduction and benzoylation of the Diels–Alder product, afforded [(1R*,2S*,4S*,6S*)-6-hydroxy-7-oxabicyclo[2.2.1]heptan-2-yl]methyl benzoate (6) and [(1R*,2R*,4R*,5S*)-5-hydroxy-7-oxabicyclo[2.2.1]heptan-2-yl]methyl benzoate (7). The key intermediates, [(1R*,2S*,4S*,6R*)-6-hydroxy-7-oxabicyclo[2.2.1]heptan-2-yl]methyl benzoate (10) and [(1R*,2R*,4R*,5R*)-5-hydroxy-7-oxabicyclo[2.2.1]heptan-2-yl]methyl benzoate (11), were prepared

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27

Elix, John A., Judith H. Wardlaw, and Isao Yoshimura. "Sublobaric Acid and Oxolobaric Acid, Two New Depsidones from the Lichen Anzia hypoleucoides." Australian Journal of Chemistry 50, no. 7 (1997): 763. http://dx.doi.org/10.1071/c97020.

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The depsidones sublobaric acid (8-hydroxy-3-methoxy-11-oxo-1-propanoyl-6-pentyl-11H-dibenzo[b,e][1,4]- dioxepin-7-carboxylic acid) (6) and oxolobaric acid (1-(1′,4′-dioxopentyl)-8-hydroxy-3-methoxy-11-oxo-6-pentyl-11H-dibenzo[b,e][1,4]dioxepin-7-carboxylic acid) (7) have been isolated from the lichenAnzia hypoleucoides together with atranorin, chloroatranorin, divaricatic acid and lobaric acid (1). The structure of compounds (6) and (7) followed from a combination of spectroscopic data.

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28

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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29

Teague, Simon J., and Simon Barber. "Synthesis of 6-substituted 5-cyano-7-hydroxy-2-carboxybenzofurans." Tetrahedron Letters 51, no. 36 (2010): 4720–22. http://dx.doi.org/10.1016/j.tetlet.2010.07.020.

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30

Wittman, Mark D., Thomas J. Alstadt, John F. Kadow, et al. "ChemInform Abstract: Stereospecific Synthesis of 7-Deoxy-6-hydroxy Paclitaxel." ChemInform 30, no. 35 (2010): no. http://dx.doi.org/10.1002/chin.199935211.

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31

de Siqueira Leite, Karla Carneiro, Lívia M. F. C. Torres, Luane Ferreira Garcia, et al. "Eletrochemical characterization of Scopoletin, a 7-hydroxy-6-methoxy-coumarin." International Journal of Electrochemical Science 10, no. 7 (2015): 5714–25. http://dx.doi.org/10.1016/s1452-3981(23)17289-0.

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32

Ribeiro da Silva, Ana Luisa, and Maria D. M. C. Ribeiro da Silva. "Energetic and Structural Studies of Two Biomass-Derived Compounds: 6- and 7-hydroxy-1-indanones." Applied Sciences 10, no. 23 (2020): 8512. http://dx.doi.org/10.3390/app10238512.

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The energetic study of 6-hydroxy-1-indanone and 7-hydroxy-1-indanone was performed using experimental techniques and computational calculations. The enthalpies of combustion and sublimation of the two compounds were determined and allowed to derive the corresponding gas-phase standard molar enthalpies of formation. For this purpose, static-bomb combustion calorimetry and drop-method Calvet microcalorimetry were the experimental techniques used. Further, the enthalpy of fusion of each compound was obtained from scanning differential calorimetry measurements. Additionally, the gas-phase standard

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33

Duan, Meili, and Michael D. Toney. "Highly Regioselective One‐Pot Synthesis of 7‐Hydroxy‐6‐methylphthalide from 3‐Hydroxy‐4‐methylbenzylalcohol." Synthetic Communications 35, no. 22 (2005): 2869–74. http://dx.doi.org/10.1080/00397910500297214.

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34

Song, Yang-Heon. "(E)-6-Hydroxy-2-oxo-2H-chromen-7-yl 3-(4-hydroxy-3-methoxyphenyl)acrylate." Molbank 2023, no. 2 (2023): M1656. http://dx.doi.org/10.3390/m1656.

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A hybrid compound 5: (E)-6-hydroxy-2-oxo-2H-chromen-7-yl 3-(4-hydroxy-3-methoxyphenyl)acrylate composed of (E)-3-(4-hydroxy-3-methoxyphenyl)acrylic acid (ferulic acid) 1 and 6,7-hydroxycoumarin (esculetin) 3 was prepared in a 61% yield by the esterification reaction of protected ferulic acid 2a with esculetin 3 in the presence of triethylamine in dichloromethane for 3 h, followed by deprotection using 3M HCl. The structure of compound 5 was confirmed by 1H, 13C NMR spectroscopy, mass-spectrometry and elemental analysis.

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35

Rodrigues, Virginia F., Rodrigo R. Oliveira, and Maria Raquel G. Vega. "A New Isocoumarin from Cajanus cajan (Fabaceae)." Natural Product Communications 9, no. 4 (2014): 1934578X1400900. http://dx.doi.org/10.1177/1934578x1400900416.

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A new isocoumarin, 3-phenyl-8-hydroxy-6-methoxy-5-γ, γ-dimethylallyl-isocoumarin, named cajavilmina (1) and eight known compounds: α-amirenone (2), β-amirenone (3), lupenone (4), 5-hydroxy-7-methoxydihydroflavone (5), longistilin C (6), 3-hydroxy-5-methoxystilbene (7), β-sitosterol (8) and stigmasterol (9) were identified in a dichloromethane fraction from Cajanus cajan leaves. Structures were elucidated by analysis of spectral data, mainly those afforded by 1H, NOEDIFF and 13C NMR (1D and 2D NMR HMQC, HMBC and COSY) and mass spectra.

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36

Nalam, Vasanth Kumar, and C. Mashelkar Uday. "Synthesis of novel3-substituted derivatives of 2H-pyrano[2,3- b]pyridine-2-one moiety." Journal of Indian Chemical Society Vol. 84, Oct 2007 (2007): 1048–51. https://doi.org/10.5281/zenodo.5827275.

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Organic Research Laboratory, SS & LS Patkar College, S. V. Road, Goregaon (West), Mumbai-400 062, India <em>E-mail</em>: vknalam@yahoo.com <em>Manuscript received 17 April 2007, accepted 20 July 2007</em> New 3-substitutcd-5-methyl-7 -hydroxy-2-oxo-2<em>H</em>/-pynmo[2,3-b )pyridine-6-carbonytrile were prepared by cyclisation of 5-methyl-6-cyano-7 -hydroxy-2-oxo-2<em>H</em>/-pyrano[2,3-b)pyridinc-3-carhohydrazidc and 3-(5-methyl thioscmicarbazidc)-5-methyl-7 -hydroxy-2-oxo2<em>H</em>/-pyrano[2,3-b]pyridinc-6-carbonytrilc with different cyclization reagents. The structures of all compounds

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37

Sinyutina, S. E., A. G. Shubina, and L. V. Rosenblum. "The Effect of Chalcones and Flavanones on Zymase Fermentation of Saccharomyces cerevisiae." Vestnik Tambovskogo gosudarstvennogo tehnicheskogo universiteta 27, no. 3 (2021): 442–48. http://dx.doi.org/10.17277/vestnik.2021.03.pp.442-448.

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The biological activity of seven chalcones and six flavanones in yeasts of the Saccharomycetaceae family has been investigated. It has been shown that 2',4'-dihydroxychalcone, 2',4'-dihydroxy-5'-ethylchalcone, 7-hydroxy-6-ethylflavanone, 7-hydroxy-6-n-hexylflavanone, 7-methoxy-6-tert-butylflavanone at a concentration of 50...100 μmol/l suppresses the metabolism of the yeast cell and reduces the zymase fermentation of Saccharomyces cerevisiae. It was found that the investigated flavanomes have no biological activity in relation to Candida albicans.

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38

Zhang, Lin, Alev Tosun, Masaki Baba, Yoshihito Okada, Lijun Wu, and Toru Okuyama. "Coumarins from Seseli hartvigii." Natural Product Communications 5, no. 7 (2010): 1934578X1000500. http://dx.doi.org/10.1177/1934578x1000500717.

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Linear-type furocoumarins, 5-[(2″ E,6″R)-6″-hydroxy-3″,7″-dimethylocta-2″,7″-dienyloxy]psoralen and 5-[(2″ E,6″ S)-6″-hydroxy-3″,7″-dimethylocta-2″,7″-dienyloxy]psoralen (1) were first isolated from whole plants of Seseli hartvigii together with one new natural product 6-(3’-methyl-2’-oxo-3’-butenyl)-7-methoxycoumarin (2), and four known compounds (tamarin, bergaptol, notoptol, and a mixture of β-sitosterol and stigmasterol). The structure of 1 was elucidated by extensive spectroscopic analysis and chemical conversion. The modified Mosher's method and HPLC were applied to determine its stereoc

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39

P., L. Majumder, Mukhoti Nirmalendu, and Chattopadhyay (nee Lahiri) Saswati. "Agrostophyllanthrol and isoagrostophyllanthrol, two novel diastereomeric phenanthropyran derivatives from the orchid Agrostophyllum khasiyanum." Journal of Indian Chemical Society Vol. 85, Dec 2008 (2008): 1315–25. https://doi.org/10.5281/zenodo.5819637.

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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 11 November 2008, accepted 17 November 2008</em> Agrostophyllanthrol and isoagrostophyllanthrol, two novel diastereomeric phenanthropyran derivatives were isolated from the orchid <em>Agrostophyllum khasiyauum</em> which earlier afforded eleven stilbenoids, viz. the two dimeric phenanthrene derivatives agrostonin [2,2', 7, 7' -tetrahydroxy-4,4' ,6,6' -tetramethoxy-1,1' -biphenanthryl] and agrostonid

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40

Hřebabecký, Hubert, Martin Dračínský, and Antonín Holý. "New carbocyclic nucleoside analogues built on a bicyclo[2.2.2]octane-2,2-dimethanol template." Collection of Czechoslovak Chemical Communications 74, no. 9 (2009): 1425–41. http://dx.doi.org/10.1135/cccc2009090.

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(1R*,4S*,6S*)-6-(6-Chloro-9H-purin-9-yl)bicyclo[2.2.2]octane-2,2-dimethanol (22) and (1R*,4R*,5S*)-5-(6-chloro-9H-purin-9-yl)bicyclo[2.2.2]octane-2,2-dimethanol (17) were prepared from (1R*,4R*)-bicyclo[2.2.2]oct-5-ene-2,2-dimethanediyl dibenzoate (7) using two approaches. The first procedure consists in hydroboration of 7, separation of obtained 6-exo-hydroxy derivative 8 and 5-exo-hydroxy derivative 9, conversion of 8 and 9 to endo-hydroxy derivatives 12 and 13, respectively, and the Mitsunobu reaction with 6-chloropurine. Only 5-(6-chloropurinyl) analogue 16 was obtained in an acceptable yi

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41

Ahmed, M. Giasuddin, Syeda Asghari Ahmed, Kawsari Akhter, et al. "Synthesis of Some Substituted Adamantane-2,4-diones from 4, 4-disubstituted Cyclohexanone Enamines and Methacryloyl Chloride." Journal of Chemical Research 2005, no. 5 (2005): 293–98. http://dx.doi.org/10.3184/0308234054323904.

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The reaction of methacryloyl chloride with the morpholine enamine 4a derived from 4-acetyl-4-isopropenylcyclo-hexanone 3a gave 4,6-anti-6-hydroxy-5,6-dimethyl-7-isopropenyladamantane-2,4-dione 6a and 4,6-syn-6-hydroxy-5,6-dimethyl-7-isopropenyladamantane-2, 4-dione 7a as racemates epimeric at 6-C. Comparable results were found for the corresponding phenyl and benzyl substituted cyclohexanones 3b and 3c. In the case of the methyl-substituted cyclohexanone 3d 4,6- anti-alcohol 7d was isolated in pure form.

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42

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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43

Verdan, Maria Helena, Carlos Augusto Ehrenfried, Dilamara Riva Scharf, et al. "Chemical Constituents from Sinningia canescens and S. warmingii." Natural Product Communications 9, no. 10 (2014): 1934578X1400901. http://dx.doi.org/10.1177/1934578x1400901033.

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A new naphthoquinone, 6-methoxy-7-hydroxy-α-dunnione (1), along with four known compounds (2, 4, 10, and 11) were isolated from Snningia canescens (Mart.) Wiehler tubers, while S. warmingii (Hiern.) Chautems furnished eight known compounds (3–10). The known compounds were identified as 7-hydroxy-α-dunnione (2), lapachenole (3), tectoquinone (4), 7-methoxytectoquinone (5), 1-hydroxytectoquinone (6), 7-hydroxytectoquinone (7), aggregatin C (8), aggregatin D (9), halleridone (10), and cedrol (11). In addition, S. canescens yielded a volatile fraction, which was analyzed by GC/FID and GC/MS. This

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44

Bunker, Kevin D., Seiji Nukui, Arnold L. Rheingold, Antonio DiPasquale, and Alex Yanovsky. "4-Chloro-7-hydroxy-6-methyl-1,7-naphthyridin-8(7H)-one." Acta Crystallographica Section E Structure Reports Online 65, no. 12 (2009): o3259. http://dx.doi.org/10.1107/s1600536809050429.

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45

Solladié, Guy, Nicolai Gehrold, and Jean Maignan. "Synthesis of (+)-(R)-5-hydroxy-6-hydroxymethyl-7-methoxy-8-methylflavanone." Tetrahedron: Asymmetry 10, no. 14 (1999): 2739–47. http://dx.doi.org/10.1016/s0957-4166(99)00266-9.

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46

Zhao, Hui, and Hai-Bin Gong. "8-Hydroxy-3,4,5-trimethyl-6-oxo-2,3,4,6-tetrahydroisoquinoline-7-carboxylic acid." Acta Crystallographica Section E Structure Reports Online 63, no. 10 (2007): o4097. http://dx.doi.org/10.1107/s1600536807045424.

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47

Fun, Hoong-Kun, Samuel Robinson Jebas, Subrata Jana, Rinku Chakrabarty, and Shyamaprasad Goswami. "2-(7-Hydroxy-2-naphthyloxy)-N-(6-methyl-2-pyridyl)acetamide." Acta Crystallographica Section E Structure Reports Online 64, no. 4 (2008): o699. http://dx.doi.org/10.1107/s1600536808006211.

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48

Ostrowska, Kinga, Gabriela Horosz, Karolina Kruk, et al. "Exploring the Potential of Coumarin Derivatives on Serotonin Receptors 5-HT1A and 5HT2A." International Journal of Molecular Sciences 26, no. 5 (2025): 1946. https://doi.org/10.3390/ijms26051946.

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A series of 2- and 3-methoxyphenylpiperazine derivatives in combination with a 2-hydroxypropoxy linker and coumarins containing various substituents was synthesized and evaluated for antidepressant-like activity. Microwave-assisted synthesis was used, and the structures of all compounds were confirmed by 1H, 13C NMR, and HRMS spectrometry. The affinity toward the 5-HT1A and 5-HT2A receptors was determined using radioligand binding assays and analyzed by molecular docking studies. Among the compounds evaluated, four demonstrated high affinity for the 5-HT1A receptor with the following Ki values

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49

Horta, Pedro, Marta S. C. Henriques, Elisa M. Brás, et al. "On the ordeal of quinolone preparation via cyclisation of aryl-enamines; synthesis and structure of ethyl 6-methyl-7-iodo-4-(3-iodo-4-methylphenoxy)-quinoline-3-carboxylate." Pure and Applied Chemistry 89, no. 6 (2017): 765–80. http://dx.doi.org/10.1515/pac-2016-1119.

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AbstractRecent studies directed to the design of compounds targeting the bc1 protein complex of Plasmodium falciparum, the parasite responsible for most lethal cases of malaria, identified quinolones (4-oxo-quinolines) with low nanomolar inhibitory activity against both the enzyme and infected erythrocytes. The 4-oxo-quinoline 3-ester chemotype emerged as a possible source of potent bc1 inhibitors, prompting us to expand the library of available analogs for SAR studies and subsequent lead optimization. We now report the synthesis and structural characterization of unexpected ethyl 6-methyl-7-i

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50

Eustache, Jacques, Jean-Michel Bernardon, and Braham Shroot. "Aromatic retinoids: A short synthesis of 7-hydroxy-6-(5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-2-napthyl)-2-naphthoic acid, (7-hydroxy-TTNN)." Tetrahedron Letters 28, no. 40 (1987): 4681–84. http://dx.doi.org/10.1016/s0040-4039(00)96596-1.

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