A versatile asymmetric synthesis of α-amino α-alkyl-phosphonic acids of high enantiomeric purity
作者:Stephen Hanessian、Youssef L. Bennani
DOI:10.1016/s0040-4039(00)97092-8
日期:1990.1
A general protocol for the synthesis of α-amino-α- alkyl phosphonic acids in either enantiomeric form is described based on the alkylation of chiral bicyclic phosphonamides derived from (R,R)- and (S,S)-1,2-diaminocyclohexane.
A simple and general asymmetric synthesis of alpha-amino phosphonic acids is described. The method involves the highly selective addition of trialkyl phosphite onto various chiral oxazolidines. Oxazaphosphorinanes thus obtained with an excellent diastereoselectivity furnish the corresponding (S)-alpha-substituted amino phosphonic acids in good overall yields and high ee (77-->97%) after simple deprotection