Synthesis of 7H-indolo[2,3-c]quinolines: study of the Pd-catalyzed intramolecular arylation of 3-(2-bromophenylamino)quinolines under microwave irradiation
作者:Steven Hostyn、Bert U.W. Maes、Gitte Van Baelen、Anna Gulevskaya、Caroline Meyers、Koen Smits
DOI:10.1016/j.tet.2005.12.062
日期:2006.5
methodology consists of two consecutive palladium-catalyzed reactions: a selective Buchwald–Hartwig amination followed by a regioselective intramolecular Heck-type reaction. The latter step has been investigated under microwave irradiation. Heating at 180 °C allows to seriously reduce the catalyst loading and get a full conversion to reaction product in 10 min. In addition, the former simplifies the
D-环取代的5-甲基-5 H-吲哚并[2,3- c ]喹啉(4)已从市售的3-溴喹啉(5)和2-溴苯胺(6)开始分三步合成。该方法包括两个连续的钯催化反应:选择性布赫瓦尔德-哈特维希胺化反应,然后是区域选择性分子内Heck型反应。已在微波辐射下研究了后一步。加热到180°C可以严重减少催化剂的负载,并在10分钟内完全转化为反应产物。另外,前者简化了纯化。