Regioselective Friedel–Crafts Reactions of N-Substituted Glyoxylamide with Indoles Catalyzed by Brønsted Acid
作者:Yong Wu、Zhen Zhan、Renjun Li、Yang Zheng、Yan Zhou、Li Hai
DOI:10.1055/s-0035-1560462
日期:——
An efficient regioselective Friedel–Craftsreaction of a series of N-substituted glyoxylamide with indoles catalyzed by Bronsted acid was developed. The reactions proceeded smoothly at room temperature and the corresponding N-substituted 2-hydroxy-2-(1H-indol-3-yl) acetamides were afforded in moderate to good yields (up to 89%). When 2 M HCl was used, the bisindole compounds were obtained in good to
hydroxyalkylation of N -substituted glyoxylamide with various indoles catalyzed by Lewis acids was developed. The reactions proceeded smoothly at room temperature and the 2-hydroxy-2-(1 H -indol-3-yl)- N -substituted acetamide resulted from the reactions catalyzed by FeSO 4 were synthesized in excellent yields (up to 93%). While the bisindole compounds were obtained when FeCl 3 was used as a catalyst