Friedel–Crafts acylation reaction using carboxylic acids as acylating agents
作者:Masato Kawamura、Dong-Mei Cui、Shigeru Shimada
DOI:10.1016/j.tet.2006.07.031
日期:2006.9
Dehydrative Friedel–Craftsacylationreaction of aromatic compounds with carboxylic acids as acylating agents was investigated in the presence of Lewis acid- or Brønsted acid-catalyst. Various metal triflates and bis(trifluoromethanesulfonyl)amides showed catalytic activity at high temperature, among which Eu(NTf2)3 proved to be the most effective and efficiently catalyzed the acylationreaction of alkyl-
A palladium-catalyzed dual C–H functionalization of substituted aromatic ketones and ester with maleimides leading to tricyclic heterocyclic molecules with good to excellent yield is reported. In this protocol, weak chelation of the carbonyl groups has been successfully utilized for the selective activation of the ortho-methyl C(sp3)–H bond instead of the ortho-C(sp2)–H bond in the presence of an external