作者:Wu Liang、Gang Liu
DOI:10.1002/cjoc.201190200
日期:2011.5
AbstractThree efficient methods to synthesize mono‐ and di‐fluorinated benzimidazoles are reported. These methods provide 5‐amino‐6‐fluoro‐benzimidazoles (5), 5,7‐difluoro‐benzimidazoles (10), and 6‐fluoro‐benzimidazoles (13) starting from commercially available 1,5‐difluoro‐2,4‐dinitrobenzene (DFDNB), 2,3,4,5‐tetrafluoro‐6‐nitrobenzoic acid (TFNBA), and 2,4‐difluoro‐1‐nitrobenzene (DFNB), respectively.