Catalytic Reaction of substituted 1,3-oxathiolanes with diazocarbonyl compounds

The reaction of substituted 1,3-oxathiolanes with diazocarbonyl compounds in the presence of Cu(OTf)2 and Rh2(OAc)4 was studied. The reaction is accompanied by the insertion of an alkoxycarbonylmethylene fragment into the C–S bond of the oxathiolane ring and leads to the formation of heterocyclic and heteroaliphatic products.