Heterocyclic derivatives of aminomethylphosphonic acid were obtained in a one-pot procedure, by treatment of the corresponding heterocyclic aldimines with a mixture of trimethyl phosphite and bromotrimethylsilane (BrTMS). A reagent for phosphorylation of the imines in this case was the tris(trimethylsilyl)phosphite, formed in situ in a reaction mixture. The silylated esters formed were hydrolyzed to the final aminophosphonic acids.
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