Synthesis of 2-(arylthio)benzoates by [3+3] cyclocondensations of 3-arylthio-1-silyloxy-1,3-butadienes with 3-oxo-orthoesters, 1,1,3,3-tetramethoxypropane and 1,1-bis(methylthio)-1-en-3-ones
作者:Muhammad Imran、Inam Iqbal、Nasir Rasool、Christine Fischer、Peter Langer
DOI:10.1016/j.tet.2009.08.078
日期:2009.10
variety of 2-arylthio-4-methoxybenzoates are regioselectively prepared by TiCl4-mediated [3+3] cyclocondensations of 3-arylthio-1-trimethylsilyloxy-1,3-butadienes with 3-oxo-orthoesters. Unsubstituted 2-(arylthio)benzoates were prepared by Me3SiOTf-catalyzed cyclization of 3-arylthio-1-trimethylsilyloxy-1,3-butadienes with 1,1,3,3-tetramethoxypropane. The TiCl4-mediated cyclization of 3-arylthio-1-trimethylsilyloxy-1
通过TiCl 4介导的3-芳硫基-1-三甲基甲硅烷氧基-1,3-丁二烯与3-氧代原酸酯的区域缩合反应,可以选择性地制备各种2-芳硫基-4-甲氧基苯甲酸酯。通过Me 3 SiOTf催化的3-芳硫基-1-三甲基甲硅烷氧基-1,3-丁二烯与1,1,3,3-四甲氧基丙烷的环化反应制得未取代的2-(芳硫基)苯甲酸酯。TiCl 4介导的1,1-双(甲硫基)-1-en-3-one与3-芳硫基-1-三甲基甲硅烷氧基-1,3-丁二烯的环化反应会导致区域选择性地形成2-芳硫基-6-(甲硫基) )苯甲酸酯