Catalytic Asymmetric Mannich-Type Reaction of<i>N</i>-Alkylidene-α-Aminoacetonitrile with Ketimines
作者:Shaoquan Lin、Yuji Kawato、Naoya Kumagai、Masakatsu Shibasaki
DOI:10.1002/anie.201412377
日期:2015.4.20
cooperative catalyst allows for an efficient stereoselective coupling of N‐alkylidene‐α‐aminoacetonitrile and ketimines to access this class of compounds bearing consecutive tetra‐ and trisubstituted stereogenic centers. The strategic use of a soft Lewis basic thiophosphinoyl group for ketimines is the key to promoting the reaction, and aliphatic ketimines serve as suitable substrates with as little as
旋光邻位二胺是有机合成中通用的手性结构单元。柔软的路易斯酸/硬布朗斯台德碱协同催化剂可实现N-亚烷基-α-氨基乙腈和酮亚胺的高效立体选择性偶联,以访问带有连续四和三取代立体中心的此类化合物。酮基酮战略性地使用柔软的路易斯碱性硫代膦酰基基团是促进反应的关键,脂族酮基酮可作为合适的底物,催化剂负载量低至3 mol%。