Facile new method for synthezising N-polyfluoroalkylated heterocycles – molecular structure of N-(bromodifluoromethyl)-4-dimethylaminopyridinium bromide
摘要:
Carbon-bromine bond cleavage is observed when 4-dimethylaminopyridine is treated with CF2Br2 and BrCF2CF2Br to yield N-(bromodifluoromethyl) and N-(2-bromo-1,1,2,2-tetrafluoromethyl)pyridinium bromides, 1-Br and 2-Br, which are reductively debrominated using Bu(3)SnH and fluorinated by anhydrous Me(4)N(+)F(-); the molecular structure of 1-Br is determined by single crystal X-ray crystallography to reveal a partial quinoidal character in the pyridine system and a hypervalent Br-... BrCF2 pairing.
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
Facile new method for synthezising N-polyfluoroalkylated heterocycles – molecular structure of N-(bromodifluoromethyl)-4-dimethylaminopyridinium bromide
Carbon-bromine bond cleavage is observed when 4-dimethylaminopyridine is treated with CF2Br2 and BrCF2CF2Br to yield N-(bromodifluoromethyl) and N-(2-bromo-1,1,2,2-tetrafluoromethyl)pyridinium bromides, 1-Br and 2-Br, which are reductively debrominated using Bu(3)SnH and fluorinated by anhydrous Me(4)N(+)F(-); the molecular structure of 1-Br is determined by single crystal X-ray crystallography to reveal a partial quinoidal character in the pyridine system and a hypervalent Br-... BrCF2 pairing.