A New Synthesis of 4<i>H</i>-1,4-Benzothiazine Derivatives Based on Ring Closure of EWG-Stabilized (2-Isocyanophenylthio)methyl Anions
作者:Kazuhiro Kobayashi、Kazutaka Hayashi、Daisuke Iitsuka、Osamu Morikawa、Hisatoshi Konishi
DOI:10.1055/s-2006-926385
日期:——
2-Cyano(phenylsulfinyl-, p-nitrophenyl-, or o-nitrophenyl-)methylthiophenyl isocyanides were synthesized from 2-aminobenzenethiols and were shown to undergo ring closure to 2,4-disubstituted 4H-1,4-benzothiazine derivatives by deprotonation of the hydrogen adjacent to the sulfur atom with sodium hydride or potassium tert-butoxide, followed by trapping with various electrophiles.
2-氰基(苯基亚磺酰基-、对-硝基苯基-或邻-硝基苯基-)甲基苯硫基异氰化物由 2-氨基苯硫醇合成,并显示通过去质子化 2,4-二取代 4H-1,4-苯并噻嗪衍生物进行闭环与硫原子相邻的氢用氢化钠或叔丁醇钾,然后用各种亲电子试剂捕获。