REARRANGEMENT OF CEPHALOSPORINS TO A PENICILLIN NUCLEUS BY THE REACTION WITH BENZYLSULFONYL CHLORIDE THROUGH A NEW EXTRUSION REACTION OF SULFUR DIOXIDE
Cephalosporins rearranged to penicillin derivatives on treatment with α-toluenesulfonyl chloride in the presence of a silylating reagent via 2,3-sigmatropic type reaction after extrusion of sulfur dioxide. This reaction also proceeded in the case of alkyl allylsulfide.