Reactions of 3??isopropenyltropolones with bromine and N??bromosuccinimide: Formation of 8H??cyclohepta [b] furan??8??one derivatives

RH Jin, BZ Yin, ZT Jin, K Imafuku

Index: Jin, Ren-Hao; Yin, Bing-Zhu; Jin, Zhong-Tian; Imafuku, Kimiaki Journal of Heterocyclic Chemistry, 1990 , vol. 27, # 3 p. 583 - 586

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Citation Number: 7

Abstract

Abstract 3-Isopropenyltropolones 1a-c were treated with bromine in carbon tetrachloride to give 3-methyl-8H-cyclohepta [b] furan-8-ones 2a-c and their corresponding 7-bromo- substituted compounds 3a-c, while reactions in acetic acid gave the bromo-substituted compounds 3a-c. On the other hand, bromination of 1a-c with N-bromosuccinimide afforded 7-bromo-3-(2-bromo-1-methylethenyl) tropolones 5a-c. The compound 2a was treated ...