Selective N-cycle hydrogenation of quinolines with sodium borohydride in aqueous media catalyzed by hectorite-supported ruthenium nanoparticles
作者:Bing Sun、Diego Carnevale、Georg Süss-Fink
DOI:10.1016/j.jorganchem.2016.07.010
日期:2016.10
new catalyst containing metallic ruthenium nanoparticles intercalated in hectorite (nanoRu′@hectorite) was found to catalyze the reduction of quinoline and quinoline derivatives by NaBH4 in aqueous solution to give selectively the corresponding 1,2,3,4-tetrahydroquinolines (N-cycle hydrogenation). In most cases the reaction can be done under mild conditions (25–60 °C) without pressure equipment, conversion
发现一种新的包含嵌入锂蒙脱石中的金属钌纳米颗粒的催化剂(nano Ru'@锂蒙脱石)可以催化NaBH 4在水溶液中还原喹啉和喹啉衍生物,从而选择性地得到相应的1,2,3,4-四氢喹啉(N -循环氢化)。在大多数情况下,该反应可以在温和的条件下(25-60°C)进行,而无需加压设备,转化率和选择性均优于99%。对于位阻衍生物,该反应可以在压力容器中在自生压力(最高9 bar)下进行。异喹啉和喹喔啉也经历选择性氮-环加氢,但是将2-苯基-喹啉加氢得到2-苯基-5,6,7,8-四氢喹啉(C-环加氢)。同位素标记实验与静电势的半经验计算相结合,支持了一种杂化氢化机理,其中涉及NaBH 4的氢化物和H 2 O的质子。催化剂纳米Ru'@锂蒙脱石可以循环再利用。