A series of readily prepared bifunctional catalysts promote the Michael addition of cyclohexanone to trans-β-nitrostyrene with excellent asymmetric induction. The enantioselection (up to 97%) and diastereoselection (up to 95:5) is comparable to other pyrrolidine-thiourea organocatalysts recently reported, however, reaction times are often shorter.
一系列易于制备的双功能催化剂促进了
环己酮与反式-
β-硝基苯乙烯的迈克尔加成,具有优异的对映选择性(最高可达97%)和差向选择性(最高可达95:5),与最近报道的其他
吡咯烷-
硫脲有机催化剂相当,然而反应时间通常较短。