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The condensation of active methylene reagents with salicylaldehyde: Novel synthesis of chromene, azaanthracene, pyrano[3,4-c]chromene and chromeno[3,4-c]pyridine derivatives

✍ Scribed by Tarek M. Abu Elmaati; Fathi M. El-Taweel; Shymaa M. Elmougi; Abdelghani Elagamey

Publisher
Journal of Heterocyclic Chemistry
Year
2004
Tongue
English
Weight
120 KB
Volume
41
Category
Article
ISSN
0022-152X

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✦ Synopsis

Abstract

On heating of the cyanoacetic acid cyclopentylidene hydrazide 1 with salicylaldehyde in the presence of bases the azaanthracene derivative 6 was formed. Also, reaction of 3 with malononitrile and ketones 10a,b afforded the pyrano[3,4‐c]chromene 9 and chromeno[3,4‐c]pyridine 11 respectively. A mechanism for these reactions is proposed.

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