Scheme 3.
Synthesis of 4-methoxy-1,2-thiazinane-1,1-dioxide (13) and 3-vinyl [1,2]thiazinane- 1,1-dioxide (15). (a) PhI(OAc)2; (b) Rh2(OAc)4, MgO, CH2Cl2, 45 °C, under argon atmosphere, 48 h; (c) p-TsOH, MeOH, H+.
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