The palladium-catalyzed asymmetric allylations of chiral enamines, derived from (S)-2-(diphenylphosphinomethyl)pyrrolidine, produced optically active α-allyl carbonyl compounds in high optical yields. The phosphino group in the chiral enamines presumably serves as a chiral ligand in these palladium-catalyzed reactions. In the transition states of π-allylpalladium complexes coordinated with the intramolecular phosphine group, the anionic counterparts or allylating reagents are considered to play an important role in controlling of the grade of the enantioselectivity.
钯催化的手性烯胺的不对称烯基化反应,源自(S)-2-(二苯膦甲基)
吡咯烷,产生了光学活性α-烯基羰基化合物,并且光学产率很高。手性烯胺中的
磷基团在这些
钯催化反应中很可能作为手性
配体。在与分子内
磷烷基团配位的π-烯基
钯配合物的过渡态中,阴离子对应物或烯基化试剂被认为在控制对映选择性的等级方面起着重要作用。