Organocatalytic Michael addition, a convenient tool in total synthesis. First asymmetric synthesis of (−)-botryodiplodin
作者:Olivier Andrey、Annick Vidonne、Alexandre Alexakis
DOI:10.1016/j.tetlet.2003.09.017
日期:2003.10
The asymmetric Michael addition of propionaldehyde to (2E)-(3-nitro-but-2-enyloxymethyl)-benzene 8, catalyzed by the chiral diamine (S,S)-N-iPr-2,2′-bipyrrolidine, afforded, with 93% ee, a precursor 9 of (−)-botryodiplodin. The nitro functionality of 9 was converted to a ketone via a Nef reaction to give, after a few steps, the enantiomerically enriched (−)-botryodiplodin.
丙醛在手性二胺(S,S)-N - i Pr-2,2'-联吡咯烷的催化下,丙醛向(2 E)-(3-硝基-丁-2-烯氧基甲基)-苯8的不对称迈克尔加成,获得了93%ee的(-)-botryodiplodin的前体9。经由Nef反应将9的硝基官能团转化为酮,从而在几步后得到对映体富集的(-)-botododiplodin。