作者:Kuan-Jen Su、Jean-Luc Mieusset、Vladimir B. Arion、Wolfgang Knoll、Lothar Brecker、Udo H. Brinker
DOI:10.1021/jo1017298
日期:2010.11.5
tetrabromobenzene; the improved, one-step procedure now employs Suzuki−Miyaura cross-coupling conditions. Intermolecular cyclopropanation of 4 with dibromocarbene gave a series of gem-dibromide adducts. Intramolecular cyclopropanation of monoadduct 5, putatively by its methyllithium-generated cyclopropylidene(oid), produced compound 11, which features a highly distorted spiropentane having a C−C−C bond
由市售的四溴苯以几乎定量的产率制备四乙烯基苯4。改进的一步法程序现在使用Suzuki-Miyaura交叉耦合条件。用二溴卡宾对4进行分子间环丙烷化,得到了一系列的宝石-二溴化物加合物。单加合物5的分子内环丙烷化,可能是由其甲基锂生成的环亚丙基(oid)生成的化合物11,该化合物具有高度扭曲的螺环戊烷,其C-C-C键角为163.5°。使用DFT计算研究了所报告螺环戊烷的稳定性。