microwave (MW) assisted fluorination of 1-arylethanones to their corresponding 1-aryl-2-fluoroethanones has been developed. The first step utilises Selectfluor™ as a fluorinating agent in methanol forming 1-aryl-2-fluoroethanones and their corresponding dimethyl acetals. In the second step, water is added and Selectfluor™ acts as a Lewis acid in the hydrolytic cleavage of the dimethyl acetals. Compared to
The preparation of the thermally stable, well-defined NHC-ligated difluoromethylated silver complexes la,b is described. The complexes were fully characterized, and the structural assignments were ambiguously further confirmed by single-crystal X-ray diffraction. Reactions of [(SIPr)Ag(CF2H)] with a variety of activated electrophiles such as diaryliodonium salts, vinyl(aryl)iodonium salts, aryldiazonium salts, and acid chlorides in the presence or absence of CuI occurred smoothly at room temperature to generate difluoromethylated compounds in good to excellent yields.
One-pot synthesis of difluoromethyl ketones by a difluorination/fragmentation process
作者:Daniel J. Leng、Conor M. Black、Graham Pattison
DOI:10.1039/c5ob02468d
日期:——
Difluoromethyl ketones are an under-studied class of ketones which have great potential as useful building blocks for materials and drug design.