Abstract Reactions of O-aryl dihydrazinothiophosphinates (4, 5) or O, O′- diarylhydrazinothio-phosphonates (2) with glycosyl isocyanates (6) gave corresponding N- (glycosylthioureylene)-aminothiophosphonic and-diaminothiophosphinic O-aryl esters. Their structures were confirmed by IR, 1 H NMR, 31 P NMR, MS and elemental analyses.