发明授权
US4393206A Process for the production of 2,3-Dihydro-4H-1,4-benzothiazines 失效
2,3-二氢-4H-1,4-苯并噻嗪的制备方法

Process for the production of 2,3-Dihydro-4H-1,4-benzothiazines
摘要:
Process for the preparation of 2,3-Dihydro-4H-1,4-benzothiazines by cyclisation of suitable 2-(2-Hydroxyalkyl)-thioanilines under elimination of water in the presence of phosphorous acid.
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