Syntheses of [1] Benzopyrano [4, 3-c] pyrazoles and-[3, 4-d] isoxazoles

T Shimizu, Y Hayashi, K Yamada, T Nishio…

Index: Shimizu; Hayashi; Yamada; et al. Bulletin of the Chemical Society of Japan, 1981 , vol. 54, # 1 p. 217 - 222

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Citation Number: 18

Abstract

The reaction of 2H-1-benzopyran with several 1, 3-dipoles gives cycloadducts in good yields. The orientation of the cycloaddition is qualitatively interpreted in terms of FMO theory. These heteropolycyclic compounds were also obtained from hydrazones of 3-aroyl-2H-1- benzopyrans, prepared from 3-cyano-2H-1-benzopyran.

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