SYNTHESIS OF 3,1-BENZOTHIAZINES FROM 2-ALKENYL- AND 2-ALKYNYLANILIDES AND LAWESSON REAGENT

[摘要]：Reaction of 2-vinylacetanilide with P(4)S(10) gave 2-vinylthioacetanilide, whereas reaction of 2-vinylacetanilide with Lawesson reagent (LR) afforded 2,4-dimethyl-4H-3,1-benzothiazine in 62% yield. Reaction of 2-alkynylanilides with LR gave 4-exomethylene-4H-3,1-benzothiazines in good yields.

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