Direct coupling of nucleophiles with nitroaromatic compounds via fluoride-promoted oxidative nucleophilic aromatic substitution for hydrogen
作者:Inma Huertas、Iluminada Gallardo、Jordi Marquet
DOI:10.1016/s0040-4039(01)00485-3
日期:2001.5
Useful yields are achieved in the regioselective directcoupling of amines, amides, and ketones with m-dinitrobenzene, 1-nitronaphthalene, and 1,3-dinitronaphthalene, through oxidatively activated nucleophilicaromatic substitution for hydrogenpromoted by fluoride anions.
Baker’s Yeast-Mediated Regioselective Reduction of 2,4-Dinitroacylanilines: Synthesis of 2-Substituted 6-Nitrobenzimidazoles
作者:Arturo Navarro-Ocaña、Luís F. Olguín、Manuel Jiménez-Estrada、Eduardo Bárzana
DOI:10.1055/s-2004-837203
日期:——
Several 2,4-dinitro-N-acylanilines were regioselectively reduced at the C-2 position by baker's yeast in slightly basic media (pH = 7.5) to afford 2-amino-4-nitroacylanilines, which were then cyclized under acidic conditions to the corresponding 2-substituted-6-nitrobenzimidazoles. The benzimidazoles thus obtained can be employed as precursors for bioactive derivatives.