一种制备2-(4 H -3,1-苯并噻嗪-4-基)乙酸衍生物和2-(2-硫代-1,2,3,4-四氢喹唑啉-4-基)乙酸的有效方法衍生物已经开发出来。3-(2-异硫氰酸根合苯基)丙酸衍生物与仲胺在室温下在甲醇中的反应生成相应的硫脲中间体,该中间体在回流温度下加热时,由于硫原子对1,4的丙烯部分的攻击而环化-addition方式,得到2-(2-二烷基氨基-4- ħ -3,1-苯并噻嗪-4-基)乙酸衍生物以一锅煮的。使用伯胺代替仲胺的类似序列提供了2- [3-烷基(或芳基)-2-硫代-1,2,3,4-四氢喹唑啉-4-基]乙酸衍生物。 4 H -3,1-苯并噻嗪-2-硫代-1,2,3,4-四氢喹唑啉-3-(2-异硫氰酸根合苯基)丙酸-硫脲-1,4-加成
A Highly Efficient Copper(I)-Catalyzed Cascade Reaction of<i>o</i>-Alkenylphenyl Isothiocyanates with Isocyanides Leading to 5<i>H</i>-Benzo[<i>d</i>]imidazo[5,1-<i>b</i>][1,3]thiazines
作者:Wenyan Hao、Jian Huang、Shanshan Jie、Mingzhong Cai
DOI:10.1002/ejoc.201500800
日期:2015.10
The highlyefficientcopper(I)-catalyzedcascadereaction of (E)-3-(2-isothiocyanatophenyl)acrylates and (E)-3-(2-isothiocyanatophenyl)acrylonitriles with isocyanides was explored. The method provides an expedient route for the synthesis of 5H-benzo[d]imidazo[5,1-b][1,3]thiazines in good to excellent yields by using CuCl (10 mol-%) as the catalyst and K3PO4 (2.0 equiv.) as the base in THF at 70 °C