Asymmetric Synthesis of <i>cis</i>-2,5-Disubstituted Pyrrolidine, the Core Scaffold of β<sub>3</sub>-AR Agonists
作者:Feng Xu、John Y. L. Chung、Jeffery C. Moore、Zhuqing Liu、Naoki Yoshikawa、R. Scott Hoerrner、Jaemoon Lee、Maksim Royzen、Ed Cleator、Andrew G. Gibson、Robert Dunn、Kevin M. Maloney、Mahbub Alam、Adrian Goodyear、Joseph Lynch、Nobuyashi Yasuda、Paul N. Devine
DOI:10.1021/ol400252p
日期:2013.3.15
practical, enantioselective synthesis of cis-2,5-disubstituted pyrrolidine is described. Application of an enzymatic DKR reduction of a keto ester, which is easily accessed through a novel intramolecular N→C benzoyl migration, yields syn-1,2-amino alcohol in >99% ee and >99:1 dr. Subsequent hydrogenation of cyclic imine affords the cis-pyrrolidine in high diastereoselectivity. By integrating biotechnology
描述了一种实用的对映选择性合成的顺式-2,5-二取代的吡咯烷。通过新颖的分子内N→C苯甲酰迁移可以很容易地获得酮酯的酶促DKR还原反应,可产生> 99%ee和> 99:1 dr的合成-1,2-氨基醇。随后环状亚胺的氢化以高非对映选择性提供顺式-吡咯烷。通过整合到生物技术有机合成和超过11层的步骤中分离只有三个中间体,β的芯支架3 -AR激动剂以38%的总产率合成。