作者:Peter I. Dalko、Virginie Brun、Yves Langlois
DOI:10.1016/s0040-4039(98)02032-2
日期:1998.12
overall yield and with ee>95%. The key step of the sequence is a stereoselective alkylation reaction of dianion derived from C2 symmetric imidazolines allowing efficient formation of quaternary benzylic center. Chiral auxiliaries derived from (S,S)-1,2-diamino-1,2-diphenylethane 1a and (S,S)-1,2-diaminocyclohexane 1b were compared. This synthesis provided unambiguous correlation of the newly formed
(-)-Memmbrine 11以7个步骤合成,总收率为19.4%,ee> 95%。该序列的关键步骤是衍生自C 2对称咪唑啉的二价阴离子的立体选择性烷基化反应,可有效形成季苄基中心。比较了衍生自(S,S)-1,2-二氨基-1,2-二苯乙烷1a和(S,S)-1,2-二氨基环己烷1b的手性助剂。该合成为新形成的立体中心提供了明确的相关性。