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
A simple and generalmethod for the asymmetric synthesis of α-aminophosphonic acids is described. A chiral phosphonate prepared in one step from R-(−)-phenylglycinol was alkylated with good diastereoselectivity using different electrophiles.