Asymmetric synthesis of phosphonotrifluoroalanine and its derivatives using N-tert-butanesulfinyl imine derived from fluoral
摘要:
Addition of dialkyl phosphites to (S)-N-tert-butanesulfinyl imine derived from fluoral afforded, under mild conditions, the corresponding N-tert-butanesulfinyl alpha-aminophosphonates in moderate to high yields and diastereoselectivity. The major diastereomers of N-tert-butanesulfinyl alpha-arninophosphonates of (S-s,S) configuration were isolated, and after partial or complete deprotection, converted into enantiomerically pure phosphonotrifluoroalanine and its dialkyl esters. (C) 2011 Elsevier Ltd. All rights reserved.