反应详情

A solution of 3-Bromo-4-hydroxy-5-nitrobenzonitrile (1.0 g, 4.11 mmol) in 20.0 mL of dry THF was added dropwise to a solution of BH3/THF 1.0 M in THF (12.3 mL) at 0° C. under N2. The reaction mixture was stirred at room temperature for 24 hours. Excess borane was decomposed by the cautious dropwise addition of 1 N HCl at 0° C. It was extracted with EtOAc, washed with NaHCO3, NaCl saturated solution and dried (Na2SO4 anh.) to give a crude. After purification by column chromatography (CH2Cl2/MeOH 8:2+1% NH4OH), 170 mg (19%) of the title compound were obtained. 1H NMR (DMSO-d6) δ 6.67 (s, 1H, H-5); 6.53 (s, 1H, H-3); 3.52 (s, 2H, CH2). 13C NMR (DMSO-d6) δ 139.7, 139.4 (C-1, C-4), 136.0 (C-2), 118.5 (C-5), 113.0 (C-3), 111.5 (C-6), 44.9 (CH2).

1. extractionIt was extracted with EtOAc
2. washwashed with NaHCO3, NaCl saturated solution
3. dry with materialdried (Na2SO4 anh.)
4. customto give a crude
5. customAfter purification by column chromatography (CH2Cl2/MeOH 8:2+1% NH4OH)