Palladium-Catalyzed Regioselective Silaboration of Pyridines Leading to the Synthesis of Silylated Dihydropyridines
作者:Kazuyuki Oshima、Toshimichi Ohmura、Michinori Suginome
DOI:10.1021/ja2020229
日期:2011.5.18
The addition of silylboronic esters to pyridine takes place in toluene at 50 °C in the presence of a palladium catalyst to give N-boryl-4-silyl-1,4-dihydropyridines in high yield. The regioselective 1,4-silaboration also proceeds in the reaction of 2-picoline and 3-substituted pyridines, whereas 4-substituted pyridines undergo 1,2-silaboration to give N-boryl-2-silyl-1,2-dihydropyridines regioselectively
在钯催化剂的存在下,在 50 °C 的甲苯中将甲硅烷基硼酸酯加成到吡啶中,以高产率得到 N-boryl-4-silyl-1,4-二氢吡啶。2-甲基吡啶和3-取代吡啶的反应也进行区域选择性1,4-硅化反应,而4-取代吡啶进行1,2-硅化反应,区域选择性地得到N-boryl-2-silyl-1,2-二氢吡啶。