Stereoisomerically Pure Trisubstituted Vinylaluminum Reagents and their Utility in Copper‐Catalyzed Enantioselective Synthesis of 1,4‐Dienes Containing
<i>Z</i>
or
<i>E</i>
Alkenes
作者:Katsuhiro Akiyama、Fang Gao、Amir H. Hoveyda
DOI:10.1002/anie.200905223
日期:2010.1.8
The desired isomer of a chiral 1,4‐diene containing an E or Z double bond can be accessed readily by a regio‐ and stereoselective hydroalumination of silyl‐substituted alkynes and subsequent enantioselective copper‐catalyzed allylic alkylation. The utility of the procedure was demonstrated through the synthesis of (−)‐nyasol (see scheme). dibal‐H=diisobutylaluminum hydride, NHC=N‐heterocyclic carbene
通过甲硅烷基取代的炔烃的区域选择性和立体选择性氢铝化以及随后的对映选择性铜催化烯丙基烷基化,可以很容易地获得含有E或Z双键的手性 1,4-二烯的所需异构体。通过 (-)-nyasol 的合成证明了该程序的实用性(参见方案)。dibal-H=二异丁基氢化铝,NHC=N-杂环卡宾。