A Copper-Catalyzed Three-Component Reaction of Tri­ethoxy­silanes, Sulfur Dioxide, and Hydrazines

A three-component reaction of triethoxysilanes, sulfur dioxide, and hydrazines catalyzed by copper­(II) acetate is reported, leading to N-amino­sulfona­mides in good yields. Not only triethoxy­(aryl)­silanes but also triethoxy­(alkyl)­silanes are compatible during the process of insertion of sulfur dioxide. Additionally, diethoxy­diaryl­silanes are suitable under the conditions as well.