N-(2-bromotetrafluoroethyl) derivatives of five-membered nitrogen-containing heterocycles
作者:Kirill I. Petko、Taras M. Sokolenko、Andreii V. Bezdudny、Lev M. Yagupolskii
DOI:10.1016/j.jfluchem.2005.07.005
日期:2005.10
The synthesis of N-(2-bromotetrafluoroethyl) derivatives of five-membered heterocycles containing one to three nitrogen atom(s) in the ring has been carried out. The reactions of these compounds with various sulfur-containing nucleophiles have been studied, and corresponding sulfides, sulfones and sulfinic acid salts were obtained.
Heteroaryl-<i>N</i>-difluoromethyltrimethylsilanes - Versatile Sources of Heteroaryl-<i>N</i>-difluoromethyl Anions in Reactions with Carbonyl Compounds
作者:German Bissky、Vasilij I. Staninets、Alexander A. Kolomeitsev、Gerd-Volker Röschenthaler
DOI:10.1055/s-2001-11389
日期:——
An efficient procedure for synthesizing heteroaryl-N-difluoromethyltrimethylsilanes - new nucleophilic difluoromethylene synthons - from easily available N-bromodifluoromethylated heterocycles, chlorotrimethylsilane and aluminium powder in triglyme or N-methylpyrrolidinone on a preparative scale in 71-75% isolated yield is described. Heteroaryl-N-difluoromethyltrimethylsilanes and benzaldehyde react under fluoride ion catalysis to give 1-(1,1-difluor-2-hydroxy-2-phenyl-ethyl)heteroaryls, whereas for anionic heteroaryl-N-difluoromethylation of cyclohexanone a stoichiometrical mixture of heteroaryl-N-difluoromethyltrimethylsilanes and tetramethylammonium fluoride has to be used.
A method for synthesizing N-trifluoromethylazole derivatives has been developed via the reaction of their sodium salts with dibromodifluoromethane and substitution of bromine by fluorine. The first ionic liquids with a trifluoromethyl group on an imidazole nitrogen atom have been synthesized.