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Reactions of 4-(dicyanomethylene)-3-methyl-1-phenyl-2-pyrazolin-5-one towards active methylene compounds

✍ Scribed by Metwally, Saoud A. M. ;El-Naggar, Galal M. ;El-Emary, Talaat I.

Publisher: John Wiley and Sons
Year: 1991
Tongue: English
Weight: 231 KB
Volume: 1991
Category: Article
ISSN: 0947-3440
DOI: 10.1002/jlac.1991199101164

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✦ Synopsis

Abstract

The reaction of some active methylene compounds with 4‐(dicyanomethylene)‐3‐methyl‐1‐phenyl‐2‐pyrazoline‐5‐one (1a) has been investigated. This reaction involves a Michael addition to afford 4‐spirocyclobutenes 3 or cyclopyran‐2‐pyrazoline‐5‐ones 4, depending on the active methylene derivatives used. A possible rationalization of the reaction pathway is proposed.

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