The dichlorocyclopropane derivative 6 prepared from 5 was treated with (−)-sparteine modified butyllithium to afford (+)-(R)-[8][10] doubly bridged allene (4) whose absolute configuration was assigned by its CD analysis.
由 5 制备的二
氯环丙烷衍
生物 6 用 (-)-sparteine 改性的丁基
锂处理,得到 (+)-(R)-[8][10] 双桥联
丙二烯 (4),其绝对构型由其 CD 分析指定。