Indian Journal of Chemistry: Sec B- Organic Chemistry including Medicinal Chemistry

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Published by: NISCAIR (CSIR)

Subjects: Chemistry

Indian Journal of Chemistry (Section B) is published by the National Institute of Science Communication and Information Resources (NISCAIR)-CSIR, New Delhi. This journal publishes articles in Organic and Medicinal Chemistry. It includes full length papers, notes and communications and short reviews. The monthly issues covers articles in organic reaction mechanism, theoretical organic chemistry, structure-activity relationships, medicinal chemistry, synthesis of chiral compounds, bio-organic chemistry, enzymes in organic synthesis, reagents in organic synthesis, heterocyclic compounds, phytochemistry (natural products), amino acids, peptides and proteins, spectroscopy in characterization of organic compounds, chemoenzymatic and enantioselective synthesis of organic compounds, synthesis of fullerenes, metal-catalyzed asymmetric reactions, bioactive plant products and combinatorial chemistry.

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Editor,
Dr. P Paravatharajan
email: prema@niscair.res.in


ISSN No. :    0376-4699
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Yb(OTf)3-catalyzed Mannich reaction of imidazo[1,2-a]pyridine and pyrazolo[1,5-a]pyrimidines
Title: Yb(OTf)3-catalyzed Mannich reaction of imidazo[1,2-a]pyridine and pyrazolo[1,5-a]pyrimidines

Authors: Pericherla, Kasiviswanadharaju; Shelke, Ganesh M; Kothari, Yash Chandresh; Kumar, Anil

Abstract: An efficient one-pot condensation reaction of imidazo[1,2-a]pyridine/pyrazolo[1,5-a] pyrimidines, aldehydes and acetamide has been investigated using Yb(OTf)3 as catalyst in 1,4-dioxane. The reaction furnishes good to excellent yield of 1-amidomethyl-imidazo[1,2-a]pyridines and 1-amidomethyl-pyrazolo[1,5-a]pyrimidines along with small quantities of bis(imidazo[1,2-a]pyridyl)methanes and bis(pyrazolo[1,5-a]pyrimidinyl)methanes. The product distribution is found to be dependent on the nature of imidazo[1,2-a]pyridine/pyrazolo[1,5-a]pyrimidines and aldehydes.

Page(s): 290-300

Double Michael adducts: Source for spiro heterocycles
Title: Double Michael adducts: Source for spiro heterocycles

Authors: Padmavathi, V; Sudheer, K; Muralikrishna, A; Padmaja, A

Abstract: The gem cyano ester functionality in double Michael adduct, 4-carboethoxy-2-carbomethoxy-4-cyano-3,5-diaryltetra-hydro[2H]thiopyran-1,1-dioxide 1 has been exploited to develop three different types of spiro heterocycles viz., spiro pyrimidine, pyrazole and isoxazole derivatives in the presence of appropriate nucleophiles.

Page(s): 283-289

Flavones and triterpenes from the leaves of Vitex peduncularis
Title: Flavones and triterpenes from the leaves of Vitex peduncularis

Authors: Rudrapaul, Prasenjit; Gruner, Margit; Knölker, Hans-Joachim; Dinda, Biswanath

Abstract: A new flavone, 4'-acetoxy-5-hydroxy-6,7-dimethoxyflavone 1 together with four known compounds, cirsimaritin 2, genkwanin 3, 3α-friedelinol 4 and 3β-friedelinol 5 have been isolated from the leaves of Vitex peduncularis Wall. (Verbenaceae). The structure of the new flavone was elucidated by detailed spectral (including 2D-NMR) and chemical studies.

Page(s): 279-282

Synthesis of novel N-aryl-3-dialkylamino-4-substituted maleimides
Title: Synthesis of novel N-aryl-3-dialkylamino-4-substituted maleimides

Authors: Patil, Nilesh S; Deshmukh, Ganesh B; Mahale, Keshao A; Gosavi, Kirankumar S; Patil, Sambhaji V

Abstract: The syntheses of several novel 3-dialkylamino-N-aryl-maleimides 3a-i and 6 are described via a conjugate elimination-addition-elimination pathway. Syntheses of their various 4-substituted derivatives 4a-i, 5a-c and 7-12 are also described. Introduction of a secondary amino group at C-3 position in N-arylmaleimides leads to the formation of enaminones 3a-i and 6, which undergo facile electrophilic substitutions at C-4 position in good to excellent yields to provide the highly functionalized maleimides 4a-i, 5a-c and 7-12.

Page(s): 272-278

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