D-homosteroid 1 was synthesized by two successive Heckreactions starting from enantiopure 3 and the bromoarene 2 containing a (Z)-bromovinyl group. The first intermolecular Pd-catalyzed reaction leads to 6 in a highly regio- and diastereoselective way which forms 1 with an unusual cis-junction of the rings B and C by a second intramolecular Heckreaction.
D-同型甾体 1 是通过两个连续的 Heck 反应合成的,起始于对映体纯 3 和含有 (Z)-溴乙烯基的溴芳烃 2。第一个分子间 Pd 催化的反应以高度区域选择性和非对映选择性的方式产生 6,通过第二个分子内 Heck 反应与 B 和 C 环的不寻常顺式连接形成 1。