Iridium-Catalyzed Allylation of Chiral β-Stereogenic Alcohols: Bypassing Discrete Formation of Epimerizable Aldehydes
作者:Daniel C. Schmitt、Anne-Marie R. Dechert-Schmitt、Michael J. Krische
DOI:10.1021/ol3030692
日期:2012.12.21
4-dinitro-C,O-benzoate complex modified by (R)- or (S)-Cl,MeO-BIPHEP promotes the transfer hydrogenative coupling of allyl acetate to β-stereogenic alcohols with good to excellent levels of catalyst-directed diastereoselectivity to furnish homoallylic alcohols. Remote electronic effects of the C,O-benzoate of the catalyst play a critical role in suppressing epimerization of the transient α-stereogenic
( R )-或( S )-Cl,MeO-BIPHEP修饰的环金属化π-烯丙基3,4-二硝基-C,O-苯甲酸配合物促进乙酸烯丙酯向β-立体醇的转移加氢偶联,具有良好到优异的性能提供高烯丙醇的催化剂导向的非对映选择性水平。催化剂的C,O-苯甲酸酯的远程电子效应在抑制瞬态 α-立体醛的差向异构化方面起着关键作用。