Studies on Substituted Heteroarenes: New Synthesis of Substituted Pyrrole, Pyridine, Pyrazolo[4,3-bpyridine, Pyrano [3,2-c]quinoline, Benzo [f] chromene, Benzo[h] chromene, Chrome - Egyptian Knowledge Bank

1436

Studies on Substituted Heteroarenes: New Synthesis of Substituted Pyrrole, Pyridine, Pyrazolo[4,3-bpyridine, Pyrano [3,2-c]quinoline, Benzo [f] chromene, Benzo[h] chromene, Chrome

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Last updated: 01 Jan 2025

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Abstract

SEVERAL new pyrazolo[4,3- b] pyridines )7a,b( were prepared by reacting arylmethylenenitriles )1a,c or 1i,j( with 4-nitrosoantipyrine )4(. Reacting 1a,b,d with 4-azidomethylcarbonylantipyrine 8 gave 2-aminopyrrole (14). Pyrano[3,2-c] quinolines (20a,b and 23) were obtained by reacting 4-hydroxyquinoline (15) with 1g, h;2b, respectively.Reaction of 1 with naphthalenediols 24,27 and 29 yield naphthodipyrans 26a,b,28a,b and 30a,b, respectively. Spironaphthodipyrans (32,33) and spironaphthopyrans (36,37) were prepared through reaction of 2a with naphthalenediols (24,27,34 and 35), respectively. Condensation of thioxothiazole (38) with 3,5-dibromo-2-hydroxybenzaldehyde gave 2H-chromene-3-carboxamide (42). 38 also reacted with 1c and 2a to gave 3,5-dicyanopyridines (45 and 47), respectively. Reaction of 2-cyano-N`-(1-thiophen-2-yl)ethylidene) acetohydrazide (49) with 1a,b afforded 3,5-dicyanopyridines (53).

DOI

10.21608/ejchem.2011.1436

Volume

Article Issue

Related Issue

307

Issue Date

2012-10-01

Receive Date

2011-11-24

Publish Date

2011-12-31

Page Start

703

Page End

721

Print ISSN

0449-2285

Online ISSN

2357-0245

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EJCHEM_Volume 54_Issue 5_Pages 703-721.pdf

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https://ejchem.journals.ekb.eg/article_1436.html

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https://ejchem.journals.ekb.eg/service?article_code=1436

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292

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Publication Title

Egyptian Journal of Chemistry

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https://ejchem.journals.ekb.eg/

MainTitle

Studies on Substituted Heteroarenes: New Synthesis of Substituted Pyrrole, Pyridine, Pyrazolo[4,3-bpyridine, Pyrano [3,2-c]quinoline, Benzo [f] chromene, Benzo[h] chromene, Chromeno [8,7-h]chromene, Chromeno[6,5-f] chromene and 2H-chromene Derivatives

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