Nonenzymatic Dynamic Kinetic Resolution of Secondary Alcohols via Enantioselective Acylation: Synthetic and Mechanistic Studies
作者:Sarah Yunmi Lee、Jaclyn M. Murphy、Atsushi Ukai、Gregory C. Fu
DOI:10.1021/ja307425g
日期:2012.9.12
Because of the ubiquity of the secondary carbinol subunit, the development of new methods for its enantioselective synthesis remains an important ongoing challenge. In this report, we describe the first nonenzymatic method for the dynamic kinetic resolution (DKR) of secondary alcohols (specifically, aryl alkyl carbinols) through enantioselective acylation, and we substantially expand the scope of this
由于二级甲醇亚基的普遍存在,开发其对映选择性合成的新方法仍然是一个重要的持续挑战。在本报告中,我们描述了通过对映选择性酰化对仲醇(特别是芳烷基甲醇)进行动态动力学拆分 (DKR) 的第一种非酶促方法,并且我们大大扩展了这种方法的范围,与酶促反应相比。简单地将醇的动力学拆分的有效方法与醇的外消旋化的活性催化剂相结合不会导致 DKR,因为钌基外消旋化催化剂与其中使用的酰化剂 (Ac(2)O) 不相容。动力学分辨率。机理研究表明,钌催化剂通过形成稳定的乙酸钌络合物而失活;this deleterious pathway was circumvented through the appropriate choice of acylating agent (an acyl carbonate). 这种新工艺的机理研究表明亲核催化剂的可逆 N-酰化,从催化剂到醇的酰基转移作为速率决定步骤,并且碳酸根阴