Domino reaction of (2-haloethyl)polyfluorophenyl sulfides, sulfoxides, and sulfones with ammonia or amines: one-pot synthesis of 3,4-dihydro-2H-1,4-benzothiazines polyfluorinated at the benzene ring and the corresponding 1-oxides and 1,1-dioxides
作者:Andrey S. Kondratyev、Vitalij D. Shteingarts、Vladimir V. Litvak、Evgeny V. Tretyakov、Alexey V. Tkachev
DOI:10.1007/s10593-018-2217-y
日期:2017.12
4-benzothiazine, corresponding 1-oxide and 1,1-dioxide, as well as some of their 4- and 6-substituted derivatives were prepared in 39–88% yields via the reaction of ammonia or primary aliphatic amines with (2-haloethyl)-2,3,5,6-tetrafluorophenyl sulfides, sulfoxides, or sulfones. Formation of the heterocyclic moiety was shown to proceed as a two-stage process starting from halogen replacement at the side chain followed
制备5,7,8-三氟-3,4-二氢-2 H -1,4-苯并噻嗪,相应的1-氧化物和1,1-二氧化物,以及它们的一些4-和6-取代的衍生物。 39–88%的产量通过氨或脂肪族伯胺与(2-卤代乙基)-2,3,5,6-四氟苯硫醚,亚砜或砜的反应。杂环部分的形成显示为两阶段过程,从侧链的卤素取代开始,然后进行分子内氨基脱氟。两种方法的反应速率之比取决于所用试剂的性质。通过对NMR光谱进行精确分析,并将实验NMR参数与通过经验加和方案和量子化学方法(DFT)计算出的NMR参数进行比较,证明了环化产物的化学结构。