Heterocyclic derivatives of aminomethylphosphonic acid were obtained in a o
ne-pot procedure, by treatment of the corresponding heterocyclic aldimines
with a mixture of trimethyl phosphite and bromotrimethylsilane (BrTMS). A r
eagent for phosphorylation of the imines in this case was the tris(trimethy
lsilyl)phosphite, formed in Sial in a reaction mixture. The silylated ester
s formed were hydrolyzed to the final aminophosphonic acids.