A new and efficient general method for the synthesis of 2-spirobenzopyrans: first synthesis of cyclic analogues of precocene I and related compounds

SY Dike, JR Merchant, NY Sapre

Index: Dike, Suneel Y; Merchant, Jaysukhlal R; Sapre, Niteen Y Tetrahedron, 1991 , vol. 47, # 26 p. 4775 - 4786

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Citation Number: 13

Abstract

A new synthesis of spirobenzopyran has been accomplished by Friedel-Crafts reaction of various m-dihydroxybenzenes and cycloalkylidene acetic acid in the presence of a Lewis acid. Starting from cycloalkylidene acetic acid novel synthesis of 2-spiro-benzopyrans has been accomplished.