Chiral Brønsted Acid-Catalyzed Enantioselective Friedel-Crafts Reaction of 4,7-Dihydroindoles with Trifluoromethyl Ketones
作者:Teng Wang、Guang-Wu Zhang、Yuou Teng、Jing Nie、Yan Zheng、Jun-An Ma
DOI:10.1002/adsc.201000510
日期:2010.11.2
In the presence of chiral phosphoric acid, an enantioselective Friedel–Crafts reaction of 4,7-dihydroindoles with aromatic trifluoromethyl ketones and ethyl 4,4,4-trifluoroacetoacetate has been realized. A series of 2-substituted 4,7-dihydroindoles with a trifluoromethylated tertiary alcohol moiety were obtained in 45–95% yields with 60–93% ee. Furthermore, 2-functionalized indole derivatives could
在手性磷酸的存在下,已经实现了4,7-二氢吲哚与芳族三氟甲基酮和4,4,4-三氟乙酰乙酸乙酯的对映选择性Friedel-Crafts反应。以45–95%的收率和60–93%ee的产率获得了一系列带有三氟甲基化叔醇部分的2-取代的4,7-二氢吲哚。此外,可以通过一锅法制备2-官能化的吲哚衍生物。