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.
Generation of heteroarylium-N-difluoromethylides and heteroaryl-N-difluoromethyl anions and their reactions with electrophiles: heteroaryl- and heteroarylium-N-difluoromethyl trimethylsilanes and a new heteroaryl-N-trifluoromethane
作者:German Bissky、Gerd-Volker Röschenthaler、Enno Lork、Jan Barten、Maurice Médebielle、Vasilij Staninets、Alexander A. Kolomeitsev
DOI:10.1016/s0022-1139(01)00390-6
日期:2001.7
1-bromodifluoromethyl-2-methyl-benzimidazole using tetrakis(dimethylamino)ethylene (TDAE) or tris(diethylamido)phosphite leads to new fluorinated carbanionic species, namely heteroarylium-N-difluoromethylides and heteroaryl-N-difluoromethyl anions. In the presence of electrophiles such as benzaldehyde, chlorodiphenylphosphine and chlorotrimethylsilane, the corresponding heteroarylium- and heteroaryl-N-difluoromethylated
N-Trihalomethyl derivatives of benzimidazole, benzotriazole and indazole
作者:Lev M Yagupolskii、Dmitrij V Fedyuk、Kirill I Petko、Valeriya I Troitskaya、Valentina I Rudyk、Vitalij V Rudyuk
DOI:10.1016/s0022-1139(00)00321-3
日期:2000.12
1-Chlorodifluoromethyl- and 1-trifluoromethyl-substituted 2-methylbenzimidazoles and benzotriazoles were obtained by chlorination of the corresponding methyl 1-azoledithiocarboxylates and subsequent fluorination of the resulting 1-trichloromethyl derivatives. The condensation of N-sodium salts of 2-alkylbenzimidazoles and indazole with CF2Br2 was shown to afford the corresponding 1-bromodifluoromethylated