Reaction of the thiolsulfonate group with the aromatic nucleus: A new ring closure

The double ring closure of N,N-bis[2- (alkyl- or arylsulfonylthio)ethyl]anilines to form 2,3,5,6-tetrahydro[1,4]thiazino[4,3,2-de][1,4]benzothiazines, a new ring system, is reported. The effects of various benzene ring substituents upon the ring closure are described.