Conversion of 1,3-thiazolidine and its sulfoxide to dihydro-1,4-thiazine |
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Authors: | Wha Suk Lee Kee Dal Nam Hoh-Gyu Hahn He Duck Mah |
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Abstract: | Two methods for constructing dihydro-1,4-thiazine 4 were described. 1,3-Thiazolidines 5 were converted to dihydro-1,4-thiazines 4 by chlorinolysis through the unisolable chlorosulfonium salt 10 and sulfenyl chloride 11 . Oxidation of the sulfides 5 gave a mixture of pairs of diasteromers 6 . In the presence of acid catalyst, both sulfoxides were converted to dihydrothiazine 4 through sulfenic acid 22 . In this reaction the stepwise ring opening involving carbocation 23 seems more probable. The structures of 4 were proven by the independent synthesis involving 3-bromo-2-oxobutanoic acid derivatives. |
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