Stereoselective allylation reactions of acyclic and chiral α-amino-β-hydroxy aldehydes
作者:In-Soo Myeong、Yong-Taek Lee、Sang-Hyun Lee、Changyoung Jung、Jin-Seok Kim、Seok-Hwi Park、Jihun Kang、Seung-Jong Lee、In-Hae Ye、Won-Hun Ham
DOI:10.1016/j.tetasy.2017.07.002
日期:2017.8
Stereoselective allylation reactions of acyclic and chiral alpha-amino-beta-hydroxy aldehydes affording chiral beta-amino-alpha,gamma-diols are described. Several Lewis acids (BF3-OEt2, SnCl4, TiCl4, ZnCl2, and MgBr2-OEt2) were employed to mediate the allylation reactions. The reactions of anti-oc-NHCbz-B-OTBS substrates mediated by SnCl4 afforded syn-selective products. The same reaction conditions also gave satisfactory results for the reactions of syn-alpha-NHCbz-beta-OTBS substrates. The mechanism involves alpha-chelation between the amido group and aldehyde oxygen. (C) 2017 Elsevier Ltd. All rights reserved.