“…[21][22][23] Conventionally,2 -imidazolidinones and other cyclic ureas are synthesized by the reaction of diamines with several reagents such as carbonyldiimidazole, [24] trichloromethyl chloroformate, [25] organic carbonates, [26,27] dithiocarbonate, [28] carbonyl selenide, [29,30] and carbon monoxide (Scheme 1). [21][22][23] Conventionally,2 -imidazolidinones and other cyclic ureas are synthesized by the reaction of diamines with several reagents such as carbonyldiimidazole, [24] trichloromethyl chloroformate, [25] organic carbonates, [26,27] dithiocarbonate, [28] carbonyl selenide, [29,30] and carbon monoxide (Scheme 1).…”