The reactions between N,N‐dimethyl enaminones and ortho‐aminothiophenols provide 1,4‐benzothiazines via cascade C−N bond transamination and C(sp²)−H sulfenylation. By employing biomass‐available ethyl lactate as a green medium, the present work offers a complementary metal‐free cross‐coupling‐based synthesis of 1,4‐benzothiazines to those known tandem reactions catalyzed by transition metals.

中文翻译：

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碘催化的乳酸-乳酸-介导的无金属级联烯胺酮氨基转移和CH磺酰化合成1,4-苯并噻嗪

N，N-二甲基烯胺酮与邻氨基苯硫酚之间的反应通过级联的C-N键转氨作用和C（sp ²）-H亚磺酰化反应提供1,4-苯并噻嗪。通过使用生物质可用的乳酸乙酯作为绿色介质，本研究为过渡金属催化的那些已知的串联反应提供了无金属的基于交叉偶联的1,4-苯并噻嗪互补合成方法。