作者:John C. Gilbert、Duen-Ren Hou、Julian W. Grimme
DOI:10.1021/jo981992i
日期:1999.3.1
The selectivity between [2 + 2] and [2 + 4] cycloadditions of cyclopentyne with spiro[2.4]nona-2,4-diene depends on the mode of generating the cycloalkyne. Using diazomethylenecyclobutane and (bromocyclobutylidenemethyl)trimethylsilane as precursors affords cyclopentyne in an unencumbered form, whereas using dibromomethylenecyclobutane and 1,2-dibromocyclopentene yields a cyclopentyne-lithium bromide
环戊炔与螺[2.4] nona-2,4-二烯的[2 + 2]和[2 + 4]环加成反应之间的选择性取决于生成环炔的方式。使用重氮亚甲基环丁烷和(溴代环丁烯基甲基)三甲基硅烷作为前驱体可以不受阻碍的形式提供环戊炔,而使用二溴亚甲基环丁烷和1,2-二溴环戊烯可以生成环戊炔-溴化锂络合物。