Candida antarctica lipase A—a powerful catalyst for the resolution of heteroaromatic β-amino esters
摘要:
Enantioselective acylations of 3-amino-3-beteroarylpropanoates (ArCH(NH2)CH2CO2Et; Ar = 2- or 3-thienyl or -furyl) were performed in the presence of Candida antarctica lipase A. As a result of the excellent chemo- and enantioselectivities (E > 100), gram-scale resolutions were carried out in ethyl butanoate. The hydrochloride salts of the unreacted R substrates and the butanamides of the reactive S enantiomers were thus prepared. (C) 2002 Elsevier Science Ltd. All rights reserved.
Chiral Lewis Base-Catalyzed, Enantioselective Reduction of Unprotected β-Enamino Esters with Trichlorosilane
作者:Jianheng Ye、Chao Wang、Lin Chen、Xinjun Wu、Li Zhou、Jian Sun
DOI:10.1002/adsc.201501061
日期:2016.3.31
reduction of N‐unsubstituted β‐enamino esters represents a major challenge for asymmetric catalysis. In this paper, the first organocatalytic system that could be used for the asymmetric hydrosilylation of N‐unsubstituted β‐enamino esters has been developed. Using N‐tert‐butylsulfinyl‐L‐proline‐derived amides and L‐pipecolinic acid‐derived formamides as catalyst, a broad range of β‐aryl‐ and β‐alkyl‐substituted