Diastereoselective Nickel-Catalyzed Reductive Aldol Cyclizations Using Diethylzinc as the Stoichiometric Reductant: Scope and Mechanistic Insight
作者:Pekka M. Joensuu、Gordon J. Murray、Euan. A. F. Fordyce、Thomas Luebbers、Hon Wai Lam
DOI:10.1021/ja0775624
日期:2008.6.1
In the presence of diethylzinc as a stoichiometric reductant, Ni(acac) 2 functions as an efficient precatalyst for the reductive aldol cyclization of alpha,beta-unsaturated carbonyl compounds tethered to a ketone electrophile through an amide or an ester linkage. The reactions are tolerant of a wide range of substitution at both alpha,beta-unsaturated carbonyl and ketone components and proceed smoothly
在二乙基锌作为化学计量还原剂的存在下,Ni(acac) 2 充当有效的预催化剂,用于通过酰胺或酯键连接到酮亲电子试剂的 α,β-不饱和羰基化合物的还原醛醇环化。这些反应在 α、β-不饱和羰基和酮组分上都可以进行广泛的取代,并且可以顺利进行以提供通常具有高非对映选择性的 β-羟基内酰胺和 β-羟基内酯。进行了一系列实验,包括氘标记研究,以试图深入了解可能起作用的可能反应机制。