In many reactions involving selenosulfonate or thiosulfonate,the sulfone group often leaves in form of benzenesulfinic acid or sodium benzenesulfinate.A one-pot two-step reaction of selenosulfonate with isocyanides and allyl alcohol under aqueous conditions to afford selenocarbamates and allyl sulfone compounds is reported.The sulfinic acid as the first-step side product is converted to the allyl sulfone compound by water promoted reaction with allyl alcohol.Water acts as both an oxygen source of selenocarbamates and as a promoter to drive the second step reaction.The reactions have the advantages of mild conditions,green,environment-friendly,and high atomic economy.