Abstract: A convenient microwave irradiation protocol was utilized for the synthesis of β- ketosulfones 1–5 in good yields. These sulfones reacted with alkenes through a radical oxidative cyclization mediated by Mn (OAc) 3. Dihydrofurans 6–10 were obtained in moderate to good yields starting from 1, 1-disubstituted alkenes. Dihydrofurans 11–15 were synthesized in moderate yields and unexpected cyclopropanes 16–19 were obtained in ...