Pd-Catalyzed regioselective synthesis of 2,6-disubstituted pyridines through denitrogenation of pyridotriazoles and 3,8-diarylation of imidazo[1,2-<i>a</i>]pyridines
6-disubstituted pyridines from pyridotriazoles throughpalladium-catalyzedaerobic oxidative denitrogenative reactions has been described. Denitrogenation of arylated pyridotriazoles generates metal-carbene intermediates in situ and provides selectively 6-aryl-2-benzoylpyridines. The same conditions have been extended to regioselective C-3 and C-8 diarylation of several imidazo[1,2-a]pyridines.
已经描述了通过钯催化的需氧氧化脱氮反应由吡啶三唑合成2,6-二取代的吡啶。芳基化吡啶三唑的脱氮原位生成金属-卡宾中间体,并选择性地提供6-芳基-2-苯甲酰基吡啶。相同的条件已经扩展到几种咪唑并[1,2- a ]吡啶的区域选择性C-3和C-8二芳基化。