Efficient preparation of an N-aryl β-amino acid via asymmetric hydrogenation and direct asymmetric reductive amination en route to Ezetimibe
摘要:
Two routes for the preparation of an N-aryl beta-amino acid, an important precursor for the cholesterol-lowering drug Ezetimibe, were investigated. The first pathway proceeds via an Rh- or Ir-catalyzed asymmetric hydrogenation of N-aryl enamine giving the desired product with up to 82% ee. The other pathway involves a direct asymmetric reductive amination (DARA) of the beta-keto ester which yielded the beta-amino ester in high yield and 97% ee. Subsequent copper-catalyzed N-arylation gave the target compound. (C) 2010 Elsevier Ltd. All rights reserved.
The present invention relates to β-amino acid esters of Formula (2), and to a method for the preparation of β-amino acid esters of formula (2) by reduction of the corresponding enamines or amination of a β-keto ester followed by condensation with a halogen-substituted benzene derivative.
Efficient preparation of an N-aryl β-amino acid via asymmetric hydrogenation and direct asymmetric reductive amination en route to Ezetimibe
作者:Guuske F. Busscher、Laurent Lefort、Jozef G.O. Cremers、Marco Mottinelli、Roel W. Wiertz、Ben de Lange、Yutaka Okamura、Yukinori Yusa、Kazuhiko Matsumura、Hideo Shimizu、Johannes G. de Vries、André H.M. de Vries
DOI:10.1016/j.tetasy.2010.04.013
日期:2010.7
Two routes for the preparation of an N-aryl beta-amino acid, an important precursor for the cholesterol-lowering drug Ezetimibe, were investigated. The first pathway proceeds via an Rh- or Ir-catalyzed asymmetric hydrogenation of N-aryl enamine giving the desired product with up to 82% ee. The other pathway involves a direct asymmetric reductive amination (DARA) of the beta-keto ester which yielded the beta-amino ester in high yield and 97% ee. Subsequent copper-catalyzed N-arylation gave the target compound. (C) 2010 Elsevier Ltd. All rights reserved.