A Straightforward Synthesis of Benzothiazines.

[摘要]：A series of 4H-3,1-benzothiazines (I, R = alkyl, aryl; Z = CO2Et, CN) have been successfully synthesized through a three-step sequence starting from com. available 2-iodoaniline. The key step consists of the cyclization of compds. II via an intramol. S-conjugate addn. The synthesis is straightforward, gives good yields and offers a broad range of possibilities since R can be many alkyl or aryl groups and Z a suitable electron-withdrawing functionalization.

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