W. Hanefeld et al., IMINIUM CARBONIC-ACID DERIVATIVE SALTS .7 . PART 1 - ELECTROPHILIC REACTIONS OF 2-METHYLTHIO-5,6-DIHYDRO-4H-1,3-THIAZINIUM IODIDES, 2-METHYLTHIO-4,5-DIHYDROTHIAZOLIUM IODIDES, AND 2-METHYLTHIO-5-METHYLTHIAZOLIUM IODIDES WITH N-NUCLEOPHILES, Archiv der pharmazie, 328(5), 1995, pp. 431-436
Cyclic salts of the dithiocarbonic acid diester imidium type (3, 5) re
act with NH2-nucleophiles to the cyclic isothioureas 6-8. Some of thes
e compounds were oxidized to cyclic isothiourea-S,S-dioxides (9, 10).