Preparation of cis-and trans-2, 3-Dimethyl-2, 3-dihydrobenzofurans and Related Compounds. Cyclizations Involving Oxonium Ions1

DP Brust, DS Tarbell, SM Hecht…

文献索引：Brust,D.P. et al. Journal of Organic Chemistry, 1966 , vol. 31, p. 2192 - 2201

全文：HTML全文

被引用次数: 16

摘要

cyclization in sulfuric acid was investigated. 0-Allylphenols have long been known to be cyclized by acids to dihydrobenzofurans or chr~ mans.~~~~' Cyclization of B-2 occurred readily in 98% sulfuric acid at room temperature to give a good yield of the diastereoisomeric dihydrobenzofurans, trans-and cis-5, 7-dichloro-2, 3-dihydro-2, 3, 4- trimethylbenzofuran (I and J)(Scheme