Photochemical, Thermal, and Base-Induced Access to Hydroazulene Derivatives via Two-Carbon Ring-Enlargement Reactions of Condensed Electrophilic Cyclobutenes
作者:Gaëtan L. Mislin、Michel Miesch
DOI:10.1021/jo025913l
日期:2003.1.1
Enamines, silyl enol ethers, and beta-keto esteranions derived from bicyclo[3.3.0]octan-2-one efficiently underwent a formal [2 + 2] cycloaddition reaction with DMAD and ethyl propynoate leading to a large variety of electrophilic cyclobutenes. The latter were transformed into polyfunctionalized bicyclo[5.3.0]decane (or hydroazulene) ring systems in high yields by fragmentation of the cyclobutene