Access to functionalized 4-benzylidene-4H-benzo[d][1,3]thiazines via tandem addition-cyclization/cross-coupling reactions
作者:Qiuping Ding、Xianjin Liu、Jinsheng Yu、Qiulan Zhang、Dan Wang、Banpeng Cao、Yiyuan Peng
DOI:10.1016/j.tet.2012.03.098
日期:2012.5
addition-cyclization reactions of various 2-alkynylbenzenamines with CS2 lead to the formation of 2-mercapto-4-benzylidene-4H-benzo[d][1,3]thiazines under mild conditions. The reactions showed moderate to excellent yields and were highly regiospecific, and only the six-membered ring was generated via 6-exo-dig S-cyclization. The reaction can be transferred to highly functionalized 4-benzylidene-4H-benzo[d][1
在温和条件下,各种2-炔基苯甲胺与CS 2的串联加成环化反应导致形成2-巯基-4-亚苄基-4 H-苯并[ d ] [1,3]噻嗪。反应显示出中等至优异的产率,并且具有高度区域特异性,并且仅通过6- exo -dig S-环化生成六元环。该反应可通过CuI催化的交叉偶联和还原偶联反应转移至高度官能化的4-亚苄基-4 H-苯并[ d ] [1,3]噻嗪。