“…On the other hand, the Burgess reagent ( 3 , Figure ) has been used as a powerful dehydrating agent in chemical synthesis for decades. It has also been employed as a convenient source of nitrogen in synthetically useful transformations such as the conversion of alcohols into carbamate derivatives, , 1,2-diols or epoxides into sulfamidates, , aminoalcohols into sulfamides, and sulfoxides into sulfilimines . On the basis of these findings, we hypothesized that it would be possible to prepare carbamate-protected guanidines through rearrangement of intermediate 4 , which can be generated in situ from thiourea and 3 (Scheme ).…”