Catalytic Asymmetric Reductive Acyl Cross-Coupling: Synthesis of Enantioenriched Acyclic α,α-Disubstituted Ketones
作者:Alan H. Cherney、Nathaniel T. Kadunce、Sarah E. Reisman
DOI:10.1021/ja402922w
日期:2013.5.22
Treatment of acid chlorides and racemic secondary benzyl chlorides with a Ni(II)/bis(oxazoline) catalyst in the presence of Mn(0) as a stoichiometric reductant generates acyclic α,α-disubstituted ketones in good yields and high enantioselectivity without requiring stoichiometric chiral auxiliaries or pregeneration of organometallic reagents. The mild, base-free reaction conditions are tolerant of a
第一个对映选择性镍催化的还原酰基交叉偶联已经开发出来。在 Mn(0) 作为化学计量还原剂的存在下,用 Ni(II)/双(恶唑啉)催化剂处理酰氯和外消旋仲苄基氯,生成无环 α,α-二取代酮,收率高,对映选择性高,无需化学计量手性助剂或有机金属试剂的预生成。温和、无碱的反应条件可以容忍两个偶联伙伴上的各种官能团。