New synthesis of alditol thiaheterocycles via ring closure of vicinal bis-cyclic thionocarbonates of alditols

A new thiaheterocyclisation of alditols involving bis-cyclic thionocarbonate derivatives as bielectrophilic intermediates is reported. The polyhydroxylated tetrahydrothiophene, tetrahydropyrane and thiepane rings from erythritol, d,l-threitol, d-arabinitol, d-mannitol and galactitol were efficiently obtained.