Pyrimido-1,4-benzothiazines and -1,4-benzothiazepines. II. Thermal and Photochemical Rearrangements of Pyrimido-1,4-benzothiazine Sulfonium Ylides
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Thermolysis of pyrimido-1,4-benzothiazine sulfonium ylides caused competitively [1,2] and [1,4] rearrangements, or β-elimination, depending upon the natures of the substituents in the ylide moiety. Ultraviolet irradiation of the methyl, ethyl and benzyl sulfonium ylides resulted exclusively in the [1,2] rearrangement followed by ring expansion leading to pyrimido-1,4-benzothiazepines. On the basis of some data, the reaction sequences of these rearrangements were discussed.
- 公益社団法人日本薬学会の論文
- 1977-02-25
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関連論文
- Pyrimido-1,4-benzothiazines and -1,4-benzothiazepines. II. Thermal and Photochemical Rearrangements of Pyrimido-1,4-benzothiazine Sulfonium Ylides
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