Sulfur-Containing Derivatives of Five-Membered Cyclic Sulfones. 2. Intramolecular Cyclization of Isothioureidothiolene 1,1-Dioxide Salts

Article abstract of DOI:10.1007/BF00475578

cis-2-Imino-4,6,7,8-tetrahydrothieno<3,4-d>thiazole 5,5-dioxides were obtained by intramolecular cyclization of 4-isothioureido-2-thiolene 1,1-dioxide salts.The reaction of N-substituted thioureas with 4-bromo-2-thiolene 1,1-dioxide leads to 3-substituted