2,6-Bis(amido)benzoic Acid with Internal Hydrogen Bond as Brønsted Acid Catalyst for Friedel-Crafts Reaction of Indoles
作者:Katsuhiko Moriyama、Toru Sugiue、Yuki Saito、Shoichi Katsuta、Hideo Togo
DOI:10.1002/adsc.201401189
日期:2015.6.15
Benzoic acid catalysts bearing two amide groups that increase the Brønsted acidity of the carboxylic acid moiety by internal hydrogen‐bonding interactions were designed as a novel class of carboxylic acid catalysts for the Friedel–Crafts reaction of indoles with β‐nitrostyrenes and 3,3‐disubstituted 3H‐indoles to obtain the corresponding Friedel–Crafts adducts in high yields. The internal hydrogen‐bonding
带有两个酰胺基团的苯甲酸催化剂通过内部氢键相互作用增加了羧酸部分的布朗斯台德酸度,被设计为一类新型的羧酸催化剂,用于吲哚与β-硝基苯乙烯和3,3-的Friedel-Crafts反应。双取代的3 H吲哚,以高收率获得相应的Friedel-Crafts加合物。与内部氢键结合的苯甲酸催化剂相比,苯胺酸具有较高的布朗斯台德酸度,后者基于DMSO中通过紫外分光光度滴定法测得的p K a得出。