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Journal articles on the topic 'Carboxaldehyd'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Chandrakanta, Bandyopadhyay, Pratim Nag Partha, Ranabir Sur Kumar, et al. "Biginelli reaction on 4-oxo-4H-1-benzopyran-3-carboxaldehyde- a search for reaction pathway." Journal of Indian Chemical Society Vol. 81, Feb 2004 (2004): 132–36. https://doi.org/10.5281/zenodo.5830113.

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Department of Chemistry, R. K. Mission Vivekananda Centenary College, Rahara, Kolkata-700 118, India <em>E-mail:</em> kantachandra@rediffmail.com <em>Manuscript recevied 31 January 2003, revised 6 May 2003. accepted 22 August 2003</em> On heating a mixture of 3-formylchromone 1, active methylene compound 2 or 3 and urea (4) in AcOH produces dihydropyrimidinones 10 or 11, whereas use of thiourea in place of urea produces 1,3-thiazine derivative 14 or 15 and the above reactions pass through the Knoevenagel condensate 5 or 6.

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2

Kemp, Chesley A., Donna K. McCullough, Dobrusia Bialonska, and Paul J. T. Johnson. "Effect of Bromination on the Quorum Sensing-Inhibiting Properties of Indole-3-Carboxaldehydes in Chromobacterium violaceum AHL System." Microbiology Research 12, no. 2 (2021): 376–82. http://dx.doi.org/10.3390/microbiolres12020025.

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Quorum sensing (QS) is a form of bacterial communication involved in the production of virulence factors in many species. As a result, inhibition of quorum sensing may be of use in mitigating pathogenesis. The signaling molecule indole is currently being investigated as a target for quorum sensing inhibition (QSI) and the indole derivative indole-3-carboxaldehyde (ICA) has been shown to inhibit quorum sensing-mediated behaviors in Escherichia coli. In this study, we investigate bromination as a method of increasing the QSI capabilities of indole carboxaldehydes. The IC50 values of three monobr

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3

Brewer, Greg, Cynthia Brewer, Raymond J. Butcher, and Peter Zavalij. "Formation of Ketimines from Aldimines in Schiff Base Condensation of Amino Acids and Imidazole-2-Carboxaldehydes: Tautomerization of Schiff Bases of Amino Acids Resulting in the Loss of Stereogenic Center." Inorganics 11, no. 10 (2023): 381. http://dx.doi.org/10.3390/inorganics11100381.

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The Schiff base reaction of imidazole-2-carboxaldehydes with the anion of alanine, leucine and phenylalanine in the presence of nickel(II) ion gives the neutral NiL2 complexes. The Schiff base ligand, L, binds through an imidazole nitrogen, NIm, the amino acid nitrogen, NAA, and a carboxylate oxygen, O, atom. The two N2O ligands bind to the nickel(II) in a meridional fashion with the NIm and O of each ligand in trans positions. These ligands can exist as the anticipated aldimine, Im − CH = NAA − CH(R) − CO2−, or the ketimine, Im − CH2NAA = C(R) − CO2−, tautomer. Tautomerization of the initiall

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4

Dvořák, Dalimil, David Šaman, Zdeněk Arnold, Ivana Císařová, and Václav Petříček. "Cycloaddition Reactions of Arylmethylenemalonaldehydes with Olefins." Collection of Czechoslovak Chemical Communications 57, no. 11 (1992): 2337–58. http://dx.doi.org/10.1135/cccc19922337.

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A series of 2,4-disubstituted 3,4-dihydro-2H-pyran-5-carboxaldehydes II-XIX was prepared by reaction of substituted arylmethylenemalonaldehydes I with 2-methylpropane, 1,1-diphenylethylene, styrene, ethyl vinyl ether, 1,1-dimethoxyethylene and 1,1-bis(methylthio)ethylene. In the case of the reaction with ethyl vinyl ether the dependence of the ratio of the arising cis- and trans- 2-ethoxy-4-aryl-3,4-dihydropyran-5-carboxaldehydes VII-XIV on the substitutent on the aromatic nucleus was studied. Information on the mechanism of this reaction was obtained and conformational equilibria of 2-ethoxy-

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5

GaOpen Chemistry 3, no. 4 (2005): 622–46. http://dx.doi.org/10.2478/bf02475192.

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AbstractThe reactions of substituted furo[3,2-b]pyrrole-5-carboxhydrazides 1 with 5-arylfuran-2-carboxaldehydes 2, 4,5-disubstituted furan-2-carboxaldehydes 3 and thiophene-2-carboxaldehyde 4 has been studied. The advantage of microwave irradiation on some of these reactions was reflected in the reduced reaction time and increased yields. Reactions of 1 with 4-substituted 1,3-oxazol-5(4H)-ones 11 led to diacylhydrazines 13 or to imidazole derivatives 14 depending on the temperature. 1,2,4-Triazole-3-thione 17 was synthesized by two-step reaction of 1 with phenylisothiocyanate and subsequent ba

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6

Gašparová, Renáta, Martin Moncman, and Branislav Horváth. "Microwave assisted reactions of 2-[3-(Trifluoromethyl)phenyl]-4-R1-furo[3,2-b] pyrrole-5-carboxhydrazides." Open Chemistry 6, no. 2 (2008): 180–87. http://dx.doi.org/10.2478/s11532-008-0009-4.

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AbstractThe effect of microwave irradiation on the reactions of 2-[3-(trifluoromethyl)phenyl]-4-R1-furo[3,2-b]pyrrole-5-carboxhydrazides 1 with 5-arylfuran-2-carboxaldehydes 2, thiophene-2-carboxaldehyde (3) and methyl 2-formylfuro[3,2-b]pyrrole-5-carboxylates 4 has been studied. Reactions of 1 with formic and acetic acid, respectively, led to acylhydrazides 9a–c. Reaction of 1a with 4-substituted 1,3-oxazol-5(4H)-one 10 led to imidazole derivative 13. 1,2,4-Triazole-3-thiones 15a,b were synthesized by two-step reaction of 1a with potassium isothiocyanate and phenyl isothiocyanate, respectivel

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7

SAMIA, R. EL-EZBAWY, and A. ALSHAIKH MONIRA. "Synthesis and Antibacterial Activity of New Diaryisulphicles containing Quinolyl, Pyrryl, 4-Thiazolidinone and/or Azetidin-2-one Moieties." Journal of Indian Chemical Society Vol. 67, May 1990 (1990): 398–400. https://doi.org/10.5281/zenodo.6163557.

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Chemistry Department, Faculty of Science, Assiut University, Assiut, Egypt Chemistry Department, Girls College of Education, Jeddah, Saudi Arabia <em>Manuscript received 3 August 1989, accepted 1 January 1990</em> Condensation of quinoline-4-carboxaldehyde and/or pyrrole-2-carboxaldebyde with 4-a minodiaryl sulphides (1) gave 4-[<em>N</em>-(ρ-(diarylthio] formimidoyliquinolines (2) and 2-[<em>N</em>-(ρ-(diarylthio)]formimidoyl]pyrroles (3) in good yields. Cyclocondensation of mercaptoacetic acid with azometbines yielded 3-[ρ-(diarylthio]-244-quinoly1)-4- thiazolidinone (4) and 3-[&

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8

Berthiaume, Sylvie L., Brian L. Bray, Petr Hess, et al. "Synthesis of 5-substituted pyrrole-2-carboxaldehydes. Part I. Generation of formal 5-lithiopyrrole-2-carboxaldehyde equivalents by bromine–lithium exchange of 2-bromo-6-(diisopropylamino)-1-azafulvene derivatives." Canadian Journal of Chemistry 73, no. 5 (1995): 675–84. http://dx.doi.org/10.1139/v95-086.

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The first known lithiated 1-azafulvene derivatives, e.g., 8 and 13a, were generated by a low-temperature bromine–lithium exchange procedure with tert-butyllithium. These lithio species show substantial stability at ≤ −90 °C because, at these temperatures, the sterically demanding 6-diisopropylamino moiety, unlike the dimethylamino group, completely inhibits nucleophilic addition to C-6. At higher temperatures, the addition of tert-butyllithium to C-6 is significant and it can become the dominant process. The lithio species 8 is a useful formal equivalent of 5-lithiopyrrole-2-carboxaldehyde sin

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9

Halawa, Ahmed H., Ahmed H. Bedair, Ahmed M. El-Agrody, et al. "Synthesis and biological activities of new bis-indole derivatives via microwave irradiation." Zeitschrift für Naturforschung B 72, no. 9 (2017): 639–46. http://dx.doi.org/10.1515/znb-2017-0039.

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AbstractThree new series of bis-indole derivatives were synthesized based onp-phenylenediamine (2–4, 5and6) and 4,4′-ethylenedianiline moieties (7–9) using facile and efficient condensation of three positional isomeric indole-carboxaldehyde derivatives (1a–c) with bifunctional amines upon microwave irradiation. The symmetric dimeric indole derivatives2–4as well as non-symmetric analogues5and6were obtained byin situcondensation of the respective positional 3-, 2- and 5-isomeric indole-carboxaldehydes withp-phenylenediamine, while compounds7–9resulted from respective condensation based on 4,4′-e

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10

Teimuri-mofrad, Reza, and Fatemeh Abrishami. "An efficient synthesis of carboxaldehyde derivatives of 4H-pyran-4-one." Canadian Journal of Chemistry 85, no. 5 (2007): 352–57. http://dx.doi.org/10.1139/v07-034.

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We developed a general method for the synthesis of various 2-mono- and 2,6-di-carboxaldehyde substituted derivatives of 3,5-diphenyl-4H-pyran-4-one and 4H-pyran-4-one. 3,5-Diphenyl-6-methyl-4-oxo-4H-pyran-2-carboxaldehyde (4a), 6-methyl-4-oxo-4H-pyran-2-carboxaldehyde (4b), 3,5-diphenyl-4-oxo-4H-pyran-2,6-dicarboxaldehyde (5a), 4-oxo-4H-pyran-2,6-dicarboxaldehyde (5b), 3,5-diphenyl-6-hydroxymethyl-4-oxo-4H-pyran-2-carboxaldehyde (10a), and 6-hydroxymethyl-4-oxo-4H-pyran-2-carboxaldehyde (10b) were obtained from the corresponding di-, tri-, and tetra-bromo derivatives of 2,6-dimethyl-3,5-diphen

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11

Galvez, Enrique, Isabel Iriepa, Antonio Lorente, Jose Miguel Mohedano, Feliciana Florencio, and Severino Garcia-Blanco. "Synthesis and structural study of aminals derived from 8-aminoquinoline and 1-aminonaphtalene." Canadian Journal of Chemistry 65, no. 4 (1987): 687–92. http://dx.doi.org/10.1139/v87-117.

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Reaction of 8-aminoquinoline with pyridine-2-carboxaldehyde (2), pyridine-3-carboxaldehyde (3), pyridine-4-carboxaldehyde (4), and benzaldehyde (5) yields the corresponding aminals or Schiff's bases according to reaction conditions; analogous results are obtained from the reaction of 1-amino-naphtalene with pyridine-2-carboxaldehyde (6). On the other hand, reaction of 8-aminoquinoline with thiophene-2-carboxaldehyde or pyrrole-2-carboxaldehyde yields neither the aminal nor the Schiff's base. Crystals of 4 (C24H19N5) belong to the triclinic space group [Formula: see text]. Cell dimensions are a

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12

K., M. BISWAS, N. DHARA R, HAl MANTI MALLIK (Mrs), and SUMITA ROY (Miss). "Nuclear Magnetic Resonance. Part-1. Dynamic 1H nmr Spectral Studies on lndole-l-carboxaldehydes." Journal of Indian Chemical Society Vol. 63, Feb 1986 (1986): 216–18. https://doi.org/10.5281/zenodo.6254928.

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Department of Chemistry, University College of Science, Univeisity of Calcutta, 92 A. P. C. Road, Calcutta-700 009  <em>Manuscript received 7 May 1984, revised 27 March 1985, accepted 2 December 1985</em> 3-Ethyhndole-1-carboxaldebyde (1) and 3-phenylmdole-1-carboxaldehyde (2) are shown to exist in (\(E\)) and (\( Z\)) conformations by dynamic <sup>1</sup>H nmr spectral studies The coalescence temperature of the two rotamers of 2 is 23<sup>0</sup> and that in the case of 1 is 50°. This difference is probably due to the effect of the electron withdrawing phenyl group of the former and

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13

Wang, Li, Xin Guo, and Lirong Han. "Effects and Inhibition Mechanism of Indole-3-Carboxaldehyde in Controlling Scutellaria baicalensis Root Rot." Horticulturae 11, no. 3 (2025): 263. https://doi.org/10.3390/horticulturae11030263.

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Scutellaria baicalensis Gorg is a medicinal herb of significant value in traditional Chinese medicine. Root rot is a major issue in S. baicalensis-producing areas. The aim of this study was to evaluate whether indole-3-carboxaldehyde, a metabolite derived from Purpureocillium lilacinum, has a significant effect on Fusarium solani (one of the main pathogenic fungi causing S. baicalensis root rot), and to clarify its antifungal mechanism. We evaluated the toxicity of indole-3-carboxaldehyde to F. solani using the growth rate assay and found that the EC50 value was 59.563 μg/mL; we also performed

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14

M., Sivasankaran Nair, Ravi Samuel Raj C., and Selwin Joseyphus R. "Computational study on imidazole-2-carboxaldehyde-glycylglycine and indole-3- carboxaldehyde-glycylglycine Schiff base ligands and equilibrium studies on their metal complexes." Journal of Indian Chemical Society Vol. 87, Jun 2010 (2010): 655–60. https://doi.org/10.5281/zenodo.5788515.

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Department of Chemistry, Manonmaniam Sundaranar University, Tirunelveli-627 012, Tamilnadu, India <em>E-mail:</em> msnairchem@rediffmail.com <em>Manuscript received 13 April 2009, revised 5 October 2009, accepted 17 November 2009</em> Semiempirical (AMI) calculations were carried out for the Schiff bases, imidazole-2-carboxaldehyde-glycylgilycine (imal-glygly) and lndole-3-carboxaldehyde-glycylglycine (indal-glygly). Five conformers or imal-glygly and indal-glygly suitable for complex formation were studied. The stable conformers were chosen for further studies. The geometrical parameters

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15

Czajkowski, David, Oludotun A. Phillips, Narender A. V. Reddy, et al. "Preparation of 7-spiroepoxy and 7,7-disubstituted cephalosporanate 1,1-dioxide from 7-diazocephalosporanate 1,1-dioxide: Reactions of 7-diazocephalosporanate 1,1-dioxide with aldehydes." Collection of Czechoslovak Chemical Communications 56, no. 11 (1991): 2352–61. http://dx.doi.org/10.1135/cccc19912352.

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The reactions of tert-butyl-3-acetoxymethyl-3-cephem-7-diazocephalosporanate 1,1-dioxide (I) with acetaldehyde, benzaldehyde, 2-thiophene caboxaldehyde, 3-thiophene carboxaldehyde, 2-furan carboxaldehyde, 3-furan carboxaldehyde and isobutyraldehyde have been studied. Use of boron trifluoride etherate as a catalyst for these reactions was found to accelerate the reactions markedly and to favour the formation of aldehydes rather than the ketones at C-7 position as the carbonyl product. The products obtained from these reactions and the ratios of carbonyl products to epoxides suggest that the R g

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16

Ibrahim, Nabila M., Hisham Abdallah A. Yosef, and Mohamed Refat H. Mahran. "Preparation and Reactions of 2-azidoquinoline-3-carboxaldehyde with Primary Amines and Active Methylene Compounds." Journal of Chemical Research 2009, no. 4 (2009): 220–24. http://dx.doi.org/10.3184/030823409x435900.

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Preparation of 2-azidoquinoline-3-carboxaldehyde has been attempted and its tautomerism has been discussed. The reactivity of 2-azidoquinoline-3-carboxaldehyde towards primary amines, hydrazines and active methylene compounds has been investigated. Analytical and spectroscopic measurements have assisted the assignment of appropriate structures to the new reaction products.

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17

Shimoda, Kei, Manabu Hamada, Hiroshi Yokoi, and Hiroki Hamada. "Chemo-Enzymatic Synthesis of Ester-Linked 2-Phenylindole-3-Carboxaldehyde-Monosaccharide Conjugate as Potential Prodrug." Biochemistry Insights 5 (January 2012): BCI.S9961. http://dx.doi.org/10.4137/bci.s9961.

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Chemo-enzymatic synthesis of ester-linked 2-phenylindole-3-carboxaldehyde-glucose conjugate (2-phenylindole-3-carboxyl-10″-O-β-D-glucosyl ester) was achieved by using plant cell cultures as biocatalysts. The anticancer agent, 2-phenylindole-3-carboxaldehyde, induced apoptosis in cells, whereas 2-phenylindole-3-carboxyl-10″-O-β-D-glucosyl ester showed no cytotoxicity and induced no apoptosis.

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18

N.M., Fawzy, M. Nasef A., M.M.E-Baroudy, M. Soliman A., and S. Aly Magdy. "New Studying for One-pot Multicomponent Reactions to Prepare Novel Furochromone Compounds with Antitumor Activity." Chemistry Research Journal 2, no. 5 (2017): 293–308. https://doi.org/10.5281/zenodo.13952196.

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The refluxing of furochromone carboxaldehyde (1) and dimethyl acetylene dicarboxylate with amine derivatives namely <em>m</em>-nitroanilline, <em>p</em>-methylanilline, <em>o</em>-aminophenol, <em>o</em>-anisidine and <em>p</em>-anisidine to give compounds (2a-e). While the reaction of mixture of furochromone carboxaldehyde (1) with dimethyl acetylendicarboxylate in the presence of cyclohexyl isocyanide to afford compound (3). The reaction mixture of furochromone carboxaldehyde (1), cyclohexyl isocyanide with cinnamic acid, chlorocarboxylic acid and/ or benzoic acid respectively to give compou

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19

Elo, Hannu. "Antimicrobial Activity of Two Antitumour Agents and Ribonucleotide Reductase Inhibitors, Pyridine-2-carboxaldehyde Thiosemicarbazone and the Acetate Form of its Copper(II) Chelate." Zeitschrift für Naturforschung C 62, no. 7-8 (2007): 498–506. http://dx.doi.org/10.1515/znc-2007-7-807.

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Some copper chelates have potent antitumour activity, and in some cases also the free ligands have activity in vivo. Yet, little is known about their antimicrobial properties. Copper( II) chelates of the thiosemicarbazones of α-N-heterocyclic carboxaldehydes constitute one important group of such agents, also their ligands having marked antitumour activity. Both the ligands and chelates inhibit ribonucleotide reductase. Some ligands have been or are under clinical trials as antineoplastic agents. I report here a study on the antimicrobial properties of the prototype compounds of this group, py

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20

Bisen, Chandrakant V., M. R. Patle, and P. K. Rahangdale. "Microwave Assisted Synthesis, Characterization and Anti-Tubercular Activity of 4-Quinolylhydrazone." Journal of Drug Delivery and Therapeutics 9, no. 4-A (2019): 95–97. http://dx.doi.org/10.22270/jddt.v9i4-a.3425.

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A series of 4-quinolylhydrazone derivatives was synthesized by reaction of 4-quinolylhydrazine and various substituted carboxaldehyde out of that most of the derivatives show significant antitubercular properties. The microwave assisted organic synthesis was applied to synthesize a series of 4-quinolylhydrazone derivatives. The characterizations of newly synthesized derivatives were done by modern analytical techniques like digital melting point apparatus, IR, NMR and mass spectroscopy. Keywords: Mycobacterium tuberculosis, Hydrazone, Quinoline, Carboxaldehyde.

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21

Dobson, A. J., and R. E. Gerkin. "9H-Fluorene-2-carboxaldehyde." Acta Crystallographica Section C Crystal Structure Communications 54, no. 12 (1998): 1890–92. http://dx.doi.org/10.1107/s0108270198009056.

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22

Stacy, Vanessa L., Guy Crundwell, James B. Updegraff III, Matthias Zeller, and Allen D. Hunter. "4-Bromothiophene-2-carboxaldehyde." Acta Crystallographica Section E Structure Reports Online 59, no. 11 (2003): o1812—o1813. http://dx.doi.org/10.1107/s1600536803023419.

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23

Shao, Si-Chang, Zhong-Lu You, Lu-Lu Tang, Yong-Shan Lin, and Hai-Liang Zhu. "Pyridine-2-carboxaldehyde picoloylhydrazone." Acta Crystallographica Section E Structure Reports Online 60, no. 12 (2004): o2185—o2186. http://dx.doi.org/10.1107/s1600536804027382.

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24

Mao, Yanli, and Francois Mathey. "A Phosphinine 2-Carboxaldehyde." Organic Letters 14, no. 4 (2012): 1162–63. http://dx.doi.org/10.1021/ol300113z.

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25

Walker, James A., and Levi M. Stanley. "N-Heterocyclic carbene-catalysed intramolecular hydroacylation to form basic nitrogen-containing heterocycles." Organic & Biomolecular Chemistry 14, no. 42 (2016): 9981–84. http://dx.doi.org/10.1039/c6ob01956k.

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N-Heterocyclic carbene-catalysed intramolecular hydroacylation of N-allylimidazole-2-carboxaldehydes and N-allylbenzimidazole-2-carboxaldehydes is reported. These exo-selective hydroacylations of unactivated alkenes enable the synthesis of a variety of basic, polycyclic nitrogen heterocycles in good-to-excellent yields.

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26

Naskar, Subhendu, Abhijit Hazra, Priyankar Paira, Krishnendu B. Sahu, Sukdeb Banerjee, and Nirup B. Mondal. "NH4Cl-Promoted Synthesis of Symmetrical and Unsymmetrical Triindolylmethanes Under Solvent-Free Conditions." Journal of Chemical Research 2008, no. 10 (2008): 568–71. http://dx.doi.org/10.3184/030823408x361101.

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The synthesis of various triindolylmethanes from indole-3-carboxaldehyde, using indole derivatives as reactants and NH4Cl as catalyst under solvent-free conditions, is described. This methodology provides access to both symmetrical and unsymmetrical triindolylmethanes in excellent yields. With N-methylindole particularly, indole-3-carboxaldehyde appears to act as a formyl donor, leading to the exclusive formation of a symmetrically trisubstituted product. The novelty of the methodology lies in its operational simplicity, environment friendly reaction conditions, and inexpensive and easy availa

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27

Daljeet, Singh Manhas*1 Anuja Chauhan. "SYNTHESIS AND NMR STUDY OF HYDROXYQUINOXALINE CARBOXALIDINE AMINO METHYL PHENOL COBALT (II) METAL COMPLEX." iajps,csk publications 03, no. 11 (2016): 1350–53. https://doi.org/10.5281/zenodo.195198.

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<em>Transition metal complex of Schiff base formed by the condensation of quinoxaline-2-carboxaldehyde with 2-aminophenol or were synthesized and characterized by NMR spectroscopy. The phenolic OH and NH signals which are found at 12.85 and 11.52 ppm in the spectrum of the ligand are not seen in the spectrum of the Co (II) complex indicating the enolisation of the Schiff base in Co (II) complex and participation of the phenolic OH group in chelation with proton displacement</em> <strong>Keywords</strong>: <em>condensation, carboxaldehyde, 2-aminophenol, Schiff base, NMR spectra</em>

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D., Ramachandiran*. "Colorimetric And Fluorimertic Sensing of Pb2+ Ion by A New N, N-Bis((Furan-2-Yl) Methylene) Benzene-1,2-Diamine Based Schiff Base Chemosensor." International Journal of Pharmacy and Biological Sciences (IJPBS) 14, no. 4 (2024): 55–61. https://doi.org/10.5281/zenodo.14558371.

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AbstractA new Schiff base N, N-bis (furan-2-yl) methylene) butane-1, 4-diamine (L) synthesized by the condensation of Furan-2-carboxaldehyde with benzene-1,2-diamine. The optical response of the compound L towards different metal ions is remarkable both colorimetric and fluorimertic response for Pb2+ ion only. The UV-Vis and fluorescence spectral studies of L with various metal ions were consistent of visual naked eye observation and stoichiometry high binding ability for new fluorescent probes for the detection of Pb (II) metal ions.KeywordsSchiff base, Furan-2-carboxaldehyde, Benzene-1,2-dia

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29

Lakshmi Reddy, Vanammoole, Parvathaneni Sai Prathima, Vaidya Jayathirtha Rao, and Raktani Bikshapathi. "An efficient synthesis of versatile synthon 3-chlorooxindoles with NaCl/oxone." New Journal of Chemistry 42, no. 24 (2018): 20152–55. http://dx.doi.org/10.1039/c8nj04855j.

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30

B., CHANDRASEKRAR, V. RAMANA D., and R. RAMADAS S. "Investigations concerning the Synthesis of Condensed Furanopyrazoles, Furanodiazepines and Furanooxazepines starting with 3-Chloro-6-methoxybenzofuran- 2-carboxaldehyde. Part-IV." Journal of Indian Chemical Society Vol. 6, June 1990 (1990): 493–96. https://doi.org/10.5281/zenodo.6202052.

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Department of Chemistry, Indian Institute of Technology, Madras-600 036 <em>Manuscript received 4 August 1989, accepted 22 January 1990</em> 3-Chloro-6-methoxybenzofuran-2-carboxaldehyde (2) on condensation with a variety of nitrogen dinucleophiles gave the expected aldimines (3a - d, 4a- d, 5). Attempted intramolecular cyclisation under the influence of acid or base catalysis or thermolysis or even photolysis of these aldimines (3a- d, 4a- d, 5) was however found to be unsuccessful. Even the chloroacetal (12) prepared from the chloroaldehyde (2) failed to undergo substitution of the halo

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31

CHANDRA, KANTA GHOSH, and BISWAS SUBHABRATA. "Benzopyrans. Part-XXVIl1. Synthesis of 2-Methyl-4-oxo- 4H-1-benzopyran-3-carboxaldehyde and 3(5)-Salicyloylpyrazole from 2-Unsubstituted 4-Oxo-4H-1- benzopyran-3-carboxaldehyde." Journal of Indian Chemical Society Vol. 67, July 1990 (1990): 568–70. https://doi.org/10.5281/zenodo.6218502.

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Organic Chemistry Laboratory, Department of Biochemistry, Calcutta University, Calcutta-700 019 <em>Manuscript received 14 February 1990, accepted 30 March 1990</em> The fused 1-pyrazoline (3), prepared from diazomethane and the acetal (2) corres-ponding to 4-oxo-4<em>H</em>-1-benzopyran-3-carboxaldehyde (1; R=H,Me, Cl and Br) gives exclusively the acetal (4) on being refluxed in toluene but a mixture of the acetal (4) and 3(5)-salicyloylpyrazole (9) on neat pyrolysis at 160-70°. The pyrazole (9) also results exclusively from percolation of a solution of the pyrazoline (3) in ethyl acetate

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32

Kalkote, Uttam R., Sharad P. Panchgalle, Kumodini K. Mahakal, Suman M. Choudhary, and Subhash P. Chavan. "A new method for the preparation of 1,2-benzisoxazole-3-carboxaldehyde." Journal of Chemical Research 2005, no. 2 (2005): 99–100. http://dx.doi.org/10.3184/0308234054497164.

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33

Sabzi, Noor Ali, and May Mohammed Jawad. "Synthesis, Characterization, and Preliminary Evaluation of Antimicrobial activity of Imines derived from Vanillic Acid Conjugated to Heterocyclic." Iraqi Journal of Pharmaceutical Sciences ( P-ISSN 1683 - 3597 E-ISSN 2521 - 3512) 32, Suppl. (2023): 8–15. http://dx.doi.org/10.31351/vol32isssuppl.pp8-15.

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The purpose of this research is to prepare new vanillic acid derivatives with 1,2,4-triazole-3-thiol heterocyclic ring and evaluate their antimicrobial activity in a preliminary assessment. A multistep synthesis was established for the preparation of new vanillic acid-triazole conjugates. The intermediate of 4-(4-amino-5-mercapto-4H-1,2,4-triazol-3-yl)-2-methoxyphenol (4) reacts with different heterocyclic aldehydes (thiophene-2-carboxaldehyde, pyrrole-2-carboxaldehyde, thiophene-3-carboxaldehyde, and furfural ) in ethanol containing few drops of acetic acid yielded the corresponding 4-(4-(sub

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Chen, Chunxiang, Daniel Hernández Maldonado, Damien Le Borgne, et al. "Synthesis of benzothiadiazole-based molecules via direct arylation: an eco-friendly way of obtaining small semi-conducting organic molecules." New Journal of Chemistry 40, no. 9 (2016): 7326–37. http://dx.doi.org/10.1039/c6nj00847j.

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35

Dvořák, Dalimil, David Šaman, Jana Hodačová, Vladimír Král, and Zdeněk Arnold. "Michael reaction of methylenemalonaldehydes: Synthetic approach to 4H-pyran-5-carboxaldehydes and 2-amino-4H-pyran-5-carboxaldehydes." Collection of Czechoslovak Chemical Communications 52, no. 11 (1987): 2687–98. http://dx.doi.org/10.1135/cccc19872687.

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Base-catalyzed addition of β-dicarbonyl compounds to methylenemalonaldehydes led to tetracarbonyl compounds II which were dehydrated in an acid medium to 4H-pyran-5-carboxaldehydes III. In the addition of compounds containing a nitrile group, the primarily formed addition products were immediately cyclized to give directly 2-amino-4H-pyran-5-carboxaldehydes V.

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36

Coskun, Demet, Misir Ahmedzade, and Sevda Kirbag. "3-(Substituted Aryl)-1-benzofuranyl-2-propenones: Antimicrobial Properties of Some Chalcones-Type Compounds and their 2-Pyrazoline Derivatives." E-Journal of Chemistry 8, no. 4 (2011): 1574–81. http://dx.doi.org/10.1155/2011/806854.

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2-Acetylbenzofuran on condensation with furan-2-carboxaldehyde and pyrrole-2-carboxaldehyde in methanolic KOH solution yielded the corresponding benzofuran chalcones. These two compounds and nine benzofuran chalcones were synthesized before, were further reacted with hydrazine hydrate in ethanol which led to the formation of 2-pyrazoline derivatives. All the synthesized compounds were characterized by elemental analysis, melting point determination, infrared spectroscopy and nuclear magnetic resonance spectroscopy. Nine chalcone-type compounds and eleven 2-pyrazolines were evaluated for their

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37

Chahma, M’hamed, and Somaiah Almubayedh. "Synthesis and characterization of terthiophene bearing stable radicals." Canadian Journal of Chemistry 99, no. 1 (2021): 24–30. http://dx.doi.org/10.1139/cjc-2020-0338.

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The synthesis and characterization of a new terthiophene bearing stable radical II is described. Through a cross coupling reaction between 2-tributylstannylthiophene and 6-(2,5-dibromo-thiophene-3-yl)pyridine-2-carboxaldehyde (2), 6-[2,2′:5′,2″]terthiophen-3′-ylpyridine-2-carboxaldehyde (3) was prepared. The condensation of 3 with 2, 4-diisopropylcarbonohydrazide bis-hydrochloride affords the heterocyclic tetrazane (4), which was oxidized with 1,4-benzoquinone to form the stable radical II. II characterized by IR, ESR, and cyclic voltammetry. Oxidative electropolymerization of II and its precu

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38

Minville, Joannie, Mélina Girardin, and Claude Spino. "Efficient preparation of chiral non-racemic sulfur compounds." Canadian Journal of Chemistry 85, no. 9 (2007): 603–18. http://dx.doi.org/10.1139/v07-091.

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p-Menthane-3-carboxaldehyde serves as an efficient chiral auxiliary in the preparation of chiral non-racemic S-alkylthiocarbamates or S-dithiocarbonates via the 3,3-sigmatropic rearrangement of the corresponding alkylthionocarbamates or xanthates. The transfer of chirality during rearrangement is complete, and the final products possess a chiral tertiary or quaternary carbon bearing sulfur. The rearranged products are then transformed into enantiopure cyclic or acyclic sulfur-containing products, depending on the means of clivage of the auxiliary. The synthesis of a potent MMP-13 inhibitor is

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39

Xiao, Dong, and Daniel M. Ketcha. "1-(BENZENESULFONYL)PYRROLE-3-CARBOXALDEHYDE." Organic Preparations and Procedures International 27, no. 4 (1995): 503–6. http://dx.doi.org/10.1080/00304949509458488.

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40

Kedziorek, Mariusz, Klaus Hafner, and Hans J. Lindner. "(Z)-Azulene-1-carboxaldehyde oxime." Acta Crystallographica Section E Structure Reports Online 59, no. 5 (2003): o657—o658. http://dx.doi.org/10.1107/s1600536803008146.

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Mariusz, Kedziorek, Klaus Hafner, and Hans J. Lindner. "(E)-Azulene-1-carboxaldehyde oxime." Acta Crystallographica Section E Structure Reports Online 59, no. 6 (2003): o860—o861. http://dx.doi.org/10.1107/s1600536803008158.

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42

Caprio, Vittorio, Michael Jones, and Margaret Brimble. "Pyridine-3-carboxaldehyde O-methyloxime." Molecules 6, no. 3 (2001): M202. http://dx.doi.org/10.3390/m202.

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43

Adly, Omima M. I., Ali Taha, Shery A. Fahmy, and Magdy A. Ibrahim. "TD-DFT calculations, dipole moments, and solvatochromic properties of 2-aminochromone-3-carboxaldehyde and its hydrazone derivatives." RSC Advances 13, no. 38 (2023): 26587–603. http://dx.doi.org/10.1039/d3ra05081e.

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2-Aminochromone-3-carboxaldehyde (ACC) and its hydrazones (ACMHCA and ACMNPHTCA) with semicarbazide hydrochloride and N-phenylthiosemicarbazide were synthesized and characterized by elemental analysis and spectral studies.

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44

Guzmán, Angel, Moises Romero, and Joseph M. Muchowski. "Vilsmeier–Haack reaction with succinamidals. A convenient synthesis of 5-chloropyrrole-2-carboxaldehydes and 5-chloropyrrole-2,4-dicarboxaldehydes." Canadian Journal of Chemistry 68, no. 5 (1990): 791–94. http://dx.doi.org/10.1139/v90-125.

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It is shown that the reaction of N-alkylsuccinamidals (2) with the Vilsmeier–Haack reagent derived from DMF and phosphorus oxychloride can be controlled to preferentially produce either 5-chloropyrrole-2-carboxaldehydes (8) or 5-chloropyrrole-2,4-dicarboxaldehydes (9). The corresponding N-unsubstituted aldehydes are obtained when N-tert-butoxycarbonylsuccinamidal (11) is the substrate in the above reactions. Keywords: Vilsmeier–Haack reaction, succinamidals, 5-chloropyrrole-2-carboxaldehydes, 5-chloropyrrole-2,4-dicarboxaldehydes.

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Sun, Daniel L., Soumya Poddar, Roy D. Pan, et al. "Isoquinoline thiosemicarbazone displays potent anticancer activity with in vivo efficacy against aggressive leukemias." RSC Medicinal Chemistry 11, no. 3 (2020): 392–410. http://dx.doi.org/10.1039/c9md00594c.

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Potent α-N-heterocyclic carboxaldehyde thiosemicarbazone (HCT) antiproliferatives were synthesized through iterative rounds of methylation and fluorination modifications, with anticancer activities being potentiated by physiological levels of copper.

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Kumari, Babli, Sisir Lohar, Sangita Adhikari, et al. "Rhodamine derived colorimetric and fluorescence mercury(ii) chemodosimeter for human breast cancer cell (MCF7) imaging." RSC Advances 5, no. 28 (2015): 21797–802. http://dx.doi.org/10.1039/c4ra14624g.

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Condensation of rhodaminehydrazone with naphthalene-1-carboxaldehyde generates a colourless probe, RDHDNAP that can selectively detect Hg<sup>2+</sup>through generation of a pink color along with significant fluorescence enhancement.

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47

Wang, Jieqiong, Weifeng Yan, Xu Cheng, Yonggang Tong, Sihong Wang, and Chunmei Jin. "The Intestinal Barrier Protective Effect of Indole Aldehyde Derivatives on Acute Toxoplasma gondii Infection." Molecules 29, no. 21 (2024): 5024. http://dx.doi.org/10.3390/molecules29215024.

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Toxoplasmosis, a zoonotic infection caused by Toxoplasma gondii (T. gondii), poses a significant risk to human health and public safety. Despite the availability of clinical treatments, none effectively mitigate the intestinal barrier damage, which is the primary defense against T. gondii invasion. This study introduced aldehyde groups into the indole scaffold of a peptide-like structure to investigate the protective effects of these indole aldehyde derivatives on the intestinal barrier in mice with acute T. gondii infection. This approach leveraged the propensity of peptides and aldehyde grou

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48

Martins-Costa, Marilia T. C., Josep M. Anglada, Joseph S. Francisco, and Manuel F. Ruiz-López. "Photosensitization mechanisms at the air–water interface of aqueous aerosols." Chemical Science 13, no. 9 (2022): 2624–31. http://dx.doi.org/10.1039/d1sc06866k.

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First-principles molecular dynamics simulations of imidazole-2-carboxaldehyde at the air–water interface highlight the role of surfactants in stabilising the reactive triplet state involved in photosensitisation reactions in aqueous aerosols.

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49

Li, Jian, Hongni Wang, Jiangtao Sun, Yang Yang, and Li Liu. "Mild gold-catalyzed three-component dehydrogenative coupling of terminal alkynes to amines and indole-2-carboxaldehyde." Org. Biomol. Chem. 12, no. 16 (2014): 2523–27. http://dx.doi.org/10.1039/c3ob42431f.

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A mild gold-catalyzed three-component dehydrogenative coupling of terminal alkynes to amines and indole-2-carboxaldehyde has been developed, which provides a practical synthetic strategy for the synthesis of indole derivatives.

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50

Chakraborty, Manisha, Sani Kundu, and Ashis Bhattacharjee. "Insights into a co-precursor driven solid-state thermal reaction of ferrocene carboxaldehyde leading to hematite nanomaterial: a reaction kinetic study." RSC Advances 13, no. 50 (2023): 34972–86. http://dx.doi.org/10.1039/d3ra07045j.

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Thermal decomposition of a mixture of ferrocene carboxaldehyde and oxalic acid dihydrate in O2 atmosphere produced rod-like hematite nanomaterial. Kinetic analysis of the reaction demonstrated the co-precursor as reaction enhancer.

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