An enantiospecific route to a potentially useful intermediate 13 in the intramolecular Diels-Alder route to steroids is described. The key step involves efficient ring cleavage of 9,10-dibromocamphor (7) to provide a monocyclic bromoester 8 of defined chirality. This is readily transformed to 13.
本研究描述了分子内 Diels-Alder 类
固醇合成路线中通向潜在有用中间体 13 的对映体特异性路线。其中的关键步骤是对 9,10-二
溴樟脑 (7) 进行有效的环状裂解,从而得到具有确定手性的单环
溴酯 8。8 很容易转化为 13。