We report on an operationally simple catalytic method for the tungsten-catalyzed hydrogenation of quinolines through the use of the easily handled and self-contained precursor [WCl(η⁵-Cp)(CO)₃]. This half sandwich complex is indefinitely storable on the bench in simple screw-capped bottles or stoppered flasks and can, if required, be prepared on a multi-gram scale while the actual catalytic transformations were performed in the presence of a Lewis acid in order to achieve both decent substrate conversions and product yields. The described method represents a facile and atom-efficient access to a variety of 1,2,3,4-tetrahydroquinolines that circumvents the use of cost-intensive and oxygen-sensitive phosphine ligands as well as auxiliary hydride reagents.

我们报告了一种操作简单的催化方法，通过使用易于处理且自给自足的前体 [WCl(η ⁵ -Cp)(CO) ₃ ] ，用于喹啉的钨催化氢化。这种半夹心复合物可以无限期地储存在简单的螺旋盖瓶或塞瓶中的工作台上，如果需要，可以在多克规模上制备，同时在 路易斯酸的存在下进行实际的催化转化，以便实现良好的底物转化率和产品产量。所描述的方法代表了对各种 1,2,3,4-四氢喹啉的简便和原子效率的访问，从而避免了成本密集型和氧敏感性膦配体以及辅助氢化物试剂的使用。