(4-Methoxyphenyl)di(pyrrolidin-1-yl)phosphine sulfides were synthesized by reaction of Lausson’s reagent with cyclic amines. It was shown for the first time that phosphine sulfides react with aryl sulfonylazides when boiled in 1,4-dioxane with the elimination of nitrogen and elemental sulfur molecules and the formation of previously undescribed dicycloaminophosphoranylidene sulfonamides.