A facile method for the synthesis of tetrasubstituted N-sulfonylguanidines has been developed via the direct condensation of sulfonamides and ureas in the presence of phosphoryl chloride under basic conditions. Detailed synthetic studies showed that this is a simple protocol for preparing N-sulfonylguanidines at room temperature in a short reaction time with good to excellent yields. Graphic abstract
An efficient synthesis of sulfonylguanidines via reaction of tetra-substituted urines with ArSO2NCO has been developed with good yields, which provides a convenient way for synthesis of sulfonyl group protected guanidine from urine in one step.