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Chandra Kanta Ghosh

Bio: Chandra Kanta Ghosh is an academic researcher from University of Calcutta. The author has contributed to research in topics: Benzopyran & Benzopyrans. The author has an hindex of 10, co-authored 53 publications receiving 400 citations.


Papers
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Journal ArticleDOI
TL;DR: From the trunk bark of Xanthoxylum rhetsa DC, lupeol and four alkaloids, namely, chelerythrine, rhetine, Rhetsine, and rhesinine, have been isolated as discussed by the authors.

23 citations

Journal ArticleDOI
TL;DR: In this paper, the authors showed that cycloadducts of dienamines with electrophilic acetylenes always undergo further transformations, resulting in the formation of xanthenone and substituted fumarate.
Abstract: Dienamine 1 with N-phenylmaleimide and chromenone 14 as well as 15 produces, through initial [4 + 2]cycloaddition, xanthenones 10 and 18, respectively Initial Michael addition of 1 to chromenones 14 and 16, and dimethyl acetylenedicarboxylate (DMAD), triggers the formation of xanthenone 19, 4-azaxanthenone 26 and substituted fumarate 49, respectively Initial [2 + 2]cycloadducts of dienamines 1–3 with electrophilic acetylenes always undergo further transformations Thus, 1 with DMAD, dibenzoylacetylene and ethyl propiolate (EP) ultimately gives xanthenones 33, 34 and 37, respectively, the latter being admixed with flavone 43 Enamine 2, cyclisable to xanthenone 11, gives 33 and 35 with DMAD, and 37 and 44 with EP Reaction of 3 with DMAD affords 36 exclusively

22 citations

Journal ArticleDOI
TL;DR: The enamine (2) as discussed by the authors is a mixture of benzopyranone and dimethylformamide dimethyl acetal and on treatment with ammonia and hydroxylamine gives the fused pyridine 2-oxide (10), pyridinioacetamidate (11), and azepine (20), respectively.
Abstract: The enamine (2), prepared from the title benzopyranone (1; R2= H, Me, and Ph) and dimethylformamide dimethyl acetal, on treatment with ammonia and hydroxylamine gives the fused pyridine (5) and pyridine 2-oxide (10), respectively. Hydrazine, phenylhydrazine, and guanidine undergo initial 1,6-addition to the enamine (2) ultimately giving the pyrazoles (14) and (15), and the pyrimidine (17), respectively. The pyridinioacetamidate (11), prepared from the enamine (2; R2= Me and Ph) and acetohydrazide, thermolyses to the fused pyridine (5). A refluxing ethanolic solution of the enamine (2; R2= Me and Ph) with ethyl glycinate forms the ester (18) which on treatment with ethanolic sodium ethoxide produces the azepine (20).

14 citations

Journal ArticleDOI
09 Jun 2015-Arkivoc
TL;DR: The publications on the title compound appearing mainly since 2007 to February 2014 are reviewed in this article, where the authors present a review of the most relevant publications on this title compound, mainly from 2007 to 2014.
Abstract: The publications on the title compound appearing mainly since 2007 to February 2014 are reviewed.

11 citations


Cited by
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Journal ArticleDOI
TL;DR: The simple β-carbolines are presented as a distinct group of alkaloids displaying structural modification of three basic ring systems and aspects of their metabolism, pharmacological properties and taxonomic significance are briefly summarized.

253 citations

Book ChapterDOI
01 Jan 1984

127 citations

Journal ArticleDOI
TL;DR: The N-methylanilino group in 2-(Nmethylonilino)-3-formylchromones, obtained in high yield by rearrangement of C(4-oxo-4H[1]-benzopyran-3-yl)-N-phenylnitrones to 2-anilino-3 -formyl-chromones followed by N-methylation, undergoes facile nucleophilic substitution by a variety of nitrogen nucleophiles, thereby paving the way for synthesis of novel 2-substituted

85 citations

Journal ArticleDOI
TL;DR: In this paper, a new reaction, the hydroxy-and aminoacyl incorporation in aliphatic and alicyclic N-hydrox-(amino)acl amides is described in detail.

72 citations