Easy access to cis-3-(benzoxazol-2-yl)cyclopentanecarboxylic acids from camphorquinone and o-aminophenols via an unexpected opening of camphor ring

摘要

An unexpected formation of cis-1,2,2-trimethyl-3-(benzoxazol-2-yl) cyclopentanecarboxylic acids was observed as the result of an oxidative C-C bond cleavage of the camphor ring in the intermediate imine during the condensation reactions between camphoroquinone and o-aminophenols conducted under open air conditions.