作者:Nicolas Germain、Laure Guénée、Marc Mauduit、Alexandre Alexakis
DOI:10.1021/ol403104s
日期:2014.1.3
An NHC–Cu complex catalyzed the asymmetric conjugate addition (ACA) of various Grignard reagents to nonactivated α-substituted cyclic enones to give 2,3-dialkylated cyclopentanones and cyclohexanones. The Michael addition features the formation of a magnesium enolate intermediate. One-pot diastereoselective trapping of this enolate by alkyl, propargyl, allyl, and benzyl halides led to ketones with
NHC-Cu络合物催化各种格氏试剂与未活化的α-取代的环烯酮的不对称共轭加成(ACA),得到2,3-二烷基化的环戊酮和环己酮。迈克尔加成物的特征是形成了烯醇镁中间体。通过烷基,炔丙基,烯丙基和苄基卤化物一锅法非对映选择性地捕获该烯醇化物,得到具有连续的α-季和β-叔中心的酮。