Benzo- 1,4-Thiazines and Related Compounds

In connection with a wider study on new indigoid dyes, the trichochrome-like chromophore (55) (see Vol. 2, pp. 772—776) has been obtained by a novel one-step inverse indigo synthesis involving the reaction of 1 mole of 2,3-di-chloromaleic anhydride (53) with 2 moles of 2-aminothiophenol or its zinc salt 

Interest in the field of condensed heterothiazines has also been noticeable, and further examples include some pyrazino[2,3-6][l,4]thiazin-6-ones 6-amino- 

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See also in sourсe #XX -- [ , ]

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