Abstract
The condensation of sodium salt of tetraethyl methylenediphosphonate with N-Cbz alaninal followed by the standard acidolytic removal of protecting groups provides an efficient method for the synthesis of 3-aminobutenylphosphonic acid E 3 ; N-Cbz-aminophosphonamidic acid 4 was prepared from diphenyl 1-amino ethylphosphonic acid through methyl phosphochloridate alanine methyl ester condensation in the presence of triethylamine and alkaline partial deprotection.
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