Reactions of trifluoromethylpyridines with alkyllithium reagents. Directing effects of the trifluoromethyl groups
作者:Jacek Porwisiak、Wojciech Dmowski
DOI:10.1016/s0040-4020(01)89575-2
日期:1994.1
Reactions of eight trifluoromethyl substituted pyridines with alkyllithium reagents were examined. 3-Trifluoromethylpyridine, 3,4-, and 3,5-bis(trifluoromethyl)pyridines undergo regioselective lithiation at the 2-position thus providing an easy access to 2-functionalised trifluoromethylpyridines. The reactions of 2-trifluoromethylpyridine, 2,4-, 2,6-bis(trifluoromethyl)-pyridines and 2,4,6-tris(tr
检查了八种三氟甲基取代的吡啶与烷基锂试剂的反应。3-三氟甲基吡啶,3,4-和3,5-双(三氟甲基)吡啶在2位上进行区域选择性锂化,因此易于获得2官能化的三氟甲基吡啶。2-三氟甲基吡啶,2,4-,2,6-双(三氟甲基)吡啶和2,4,6-三(三氟甲基)吡啶的反应仅通过将RLi加成-NC-键而产生。2,5-双(三氟甲基吡啶),取决于反应温度,可生成2-lithio衍生物或加合物。