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
An efficient method for hydroazulenone from bicyclo[3.3.0]octanone via two carbon annulation
作者:Chwang Siek Pak、Sung Kee Kim、Hyeon Kyu Lee
DOI:10.1016/s0040-4039(00)79451-2
日期:1991.10
Hydroazulenones and hydroazulenediones are prepared efficiently from bicyclo[3.3.0]octanones via two carbon annulation utilizing thermal [2+2] cycloaddition of dichloroketene and fluoride or chloride induced fragmentation of the cycloadduct.