Reactions of aza-ortho-xylylenes generated from 2,1-benzisothiazoline 2,2-dioxides.
作者:Krzysztof Wojciechowski
DOI:10.1016/s0040-4020(01)87205-7
日期:1993.8
Thermal extrusion of SO2 from 2,1-benzisothiazoline 2,2-dioxides 2 leads to aza-ortho-xylylenes 3, which depending on the substituents undergo various transformations. Aza-ortho-xylylenes substituted at the position 4, 5, and 6 gave Diels-Alder reactions with maleic acid derivatives 4 leading to cis-1,2,3,4-tetrahydroquinoline 2,3-dicarboxylic acid derivatives 5 in high yields. 7-Substituted derivatives
从2,1-苯并噻唑啉2,2-二氧化物2热挤出SO 2会生成氮杂邻二甲苯3,取决于取代基,它们会经历各种转化。在4、5和6位取代的氮杂邻二甲苯基与马来酸衍生物4进行狄尔斯-阿尔德反应,从而以高收率得到顺式-1,2,3,4-四氢喹啉2,3-二羧酸衍生物5。7-取代的衍生物经历[1,5]氢转移,导致邻甲苯胺衍生物9和10。氮杂-邻-xylylenes从产生N-(4-戊烯基)和N-(5-己烯基)衍生物11给出了分子内狄尔斯-阿尔德反应的产物。