We report an efficient and scalable synthesis of 7-methoxy-2,3,4,5-tetrahydrobenzo[1,4]thiazepine, the core structure of biologically active molecules like JTV-519 and S107. This synthetic route, starting with 4-methoxythiophenol and proceeding via acyliminum cyclization, gives the target product in four steps and 68% overall yield and is a substantial improvement over previously published processes. Nine additional examples of tetrahydrobenzo[1,4]thiazepine synthesis via acyliminium ring closure are also presented.

中文翻译：

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N-酰基亚胺基环化反应合成2,3,4,5-四氢苯并[1,4]噻嗪类

我们报告了7-甲氧基-2,3,4,5-四氢苯并[1,4]硫氮平的有效和可扩展的合成，该生物活性分子如JTV-519和S107的核心结构。该合成路线从4-甲氧基硫酚开始，并通过亚胺基环化进行，分四个步骤提供目标产物，总收率达68％，与以前公布的工艺相比有实质性的改进。还提供了通过酰基亚胺环闭环合成四氢苯并[1,4]噻氮平的另外九个实例。