Access to [2,1]Benzothiazine <i>S</i>,<i>S</i>-Dioxides from β-Substituted <i>o</i>-Nitrostyrenes and Sulfur
作者:Thi Mo Nguyen、Hoang Anh Cao、Thi Thuong Thuong Cao、Satoki Koyama、Dinh Hung Mac、Thanh Binh Nguyen
DOI:10.1021/acs.joc.0c00918
日期:2020.10.2
[2,1]Benzothiazine S,S-dioxides 2 were synthesized by simply heating o-nitrostyrenes with elemental sulfur in 3-picoline with complete atom economy. This reaction was found to occur without any added catalyst and consist of a cascade of reduction of the nitro group, sulfuration of a C–H of the double bond, oxidation of a sulfur atom to its highest oxidation state by the migration of two oxygen atoms
[2,1]苯并噻嗪S,S-二氧化物2是通过在3-甲基吡啶中简单加热邻硝基苯乙烯与元素硫而合成的,具有完全的原子经济性。发现该反应在不添加任何催化剂的情况下发生,包括级联的硝基还原,双键CH的硫化,通过两个氧原子的迁移将硫原子氧化至最高氧化态来自硝基,并形成新的N–S键。此外,该方法还可以应用于邻硝基肉桂酰胺和肉桂酸酯。