Asymmetric addition of dialkyl phosphite and diamido phosphite anions to chiral, enantiopure sulfinimines: a new, convenient route to enantiomeric α-aminophosphonic acids
作者:Marian Mikolajczyk、Piotr Łyżwa、Józef Drabowicz
DOI:10.1016/s0957-4166(97)00606-x
日期:1997.12
Lithium or sodium dialkyl phosphites and diamido phosphites 3 undergo addition to (+)-(S)-benzylidene-p-toluenesulfinamide 2 affording N-sulfinyl-alpha-aminophosphonates 4 in a diastereoisomeric ratio from 63:37 to 94:6. The major diastereoisomers formed in addition of lithium dimethyl phosphite 3a and lithium bis-diethylamido phosphite 3e to (+)-(S)-2 were separated and converted into enantiopure (+)-(R)- and (-)-(S)-alpha-aminobenzyl phosphonic acids 5, respectively. (C) 1997 Published by Elsevier Science Ltd. All rights reserved.