A novel strategy for the enantioselective synthesis of the steroidal framework using cascade ring expansion reactions of small ring systems-asymmetric total synthesis of (+)-equilenin
作者:Hideo Nemoto、Masahiro Yoshida、Keiichiro Fukumoto、Masataka Ihara
DOI:10.1016/s0040-4039(98)02479-4
日期:1999.1
Enantioselective synthesis of (+)-equilenin (1) utilizing a novel strategy is described. The key steps are two cascade ring expansion reactions of small ring systems; 1) chiral (salen)MnIII complex-catalyzed cascade reaction of cyclopropylidene; 2) PdII-mediated cascade reaction of the cyclobutanol.
描述了利用一种新策略的对映体合成(+)-quilenin(1)。关键步骤是小环系统的两个级联环膨胀反应。1)手性(salen)Mn III配合物催化的环亚丙基级联反应; 2)Pd II介导的环丁醇的级联反应。