OO-Di-trimethylsilyl esters of alpha-N-benzyloxycarbonylaminoalkylphosphinates (III) undergo triethylamine catalyzed addition to isothiocyanates to give after hydrolysis, a series of new alpha-aminoalkyl-(N-substituted)thiocarbamoyl-phosphinates. Thiocarbamoyl-phosphinate moiety can be included in the structures of the metalloproteinase inhibitors as the zinc-binding group and the new compounds reported here are good inhibitors of important aminopeptidase N(CD13) with IC(50) in range of 10.56-0.25 microM.