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-
Rare-earth metal Lewis acids, in particular Eu(NTf2)3, were found to be efficient catalysts for Friedel–Craftsacylationreactionusing aliphatic as well as aromatic carboxylic acids as acylating agents at high temperature.
REACTION OF MIXED CARBOXYLIC ANHYDRIDES WITH GRIGNARD REAGENTS. A USEFUL METHOD FOR THE PREPARATION OF KETONES
作者:Masashi Araki、Teruaki Mukaiyama
DOI:10.1246/cl.1974.663
日期:1974.7.5
It was found that common ketones were prepared in good yields by the reaction of grignard reagents with mixed carboxylic anhydrides composed of o-substituted benzoic acids or pivalic acid and common carboxylic acids at −20 or −78°C. Further, it was established that a 1,4-diketone such as 2,5-dioxoundecane, a precursor of dihydrojasmone was synthesized in 71∼82% yields from levulinic acid by one step