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Selective synthesis of some 5-hydrazono-5,6,7,8-tetrahydro-2H-1-benzopyran-2-ones

✍ Scribed by Polonca Trebše; Boris Recelj; Marijan Kočevar; Slovenko Polanc

Publisher: Journal of Heterocyclic Chemistry
Year: 1997
Tongue: English
Weight: 320 KB
Volume: 34
Category: Article
ISSN: 0022-152X
DOI: 10.1002/jhet.5570340425

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✦ Synopsis

Abstract

A simple, highly selective transformation of 5,6,7,8‐tetrahydro‐2__H__‐1‐benzopyran‐2,5‐diones 1–3 and 14 with some phenylhydrazines and heterocyclic hydrazines to 5‐hydrazono‐2__H__‐1‐benzopyran‐2‐ones 4–12 and 15–16 is described. Under more severe conditions the hydrazonoquinoline derivative 17 was obtained from the benzopyran derivative 3 and Phenylhydrazine.

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