Catalytic, Enantioselective N-Acylation of Lactams and Thiolactams Using Amidine-Based Catalysts
作者:Xing Yang、Valentina D. Bumbu、Peng Liu、Ximin Li、Hui Jiang、Eric W. Uffman、Lei Guo、Wei Zhang、Xuntian Jiang、K. N. Houk、Vladimir B. Birman
DOI:10.1021/ja306766n
日期:2012.10.24
contrast to alcohols and amines, racemic lactams and thiolactams cannot be resolved directly via enzymatic acylation or classical resolution. Asymmetric N-acylation promoted by amidine-based catalysts, particularly Cl-PIQ 2 and BTM 3, provides a convenient method for the kinetic resolution of these valuable compounds and often achieves excellent levels of enantioselectivity in this process. Density
与醇和胺不同,外消旋内酰胺和硫内酰胺不能通过酶促酰化或经典拆分直接拆分。由脒基催化剂,特别是 Cl-PIQ 2 和 BTM 3 促进的不对称 N-酰化,为这些有价值的化合物的动力学拆分提供了一种方便的方法,并且通常在该过程中实现了出色的对映选择性。密度泛函理论计算表明,反应通过内酰胺互变异构体的 N-酰化发生,阳离子-π 相互作用在内酰胺底物的手性识别中起关键作用。