反应详情

To 4-[2-methyl-5-(methyloxy)-4-nitrophenyl]-1-propylpyridinium iodide (1.04 g, 2.51 mmol) in 25 mL of MeOH at 0° C. was added, NaBH4 (0.284 g, 7.53 mmol) over 1 h. The mixture was allowed to come to rt over 2 h. The solvent was reduced to approximately 5 mL and then diluted with EtOAc, washed with conc. NaHCO3, dried (Na2SO4), filtered, rotovaped down, and purified by flash chromatography to give the title compound of step C (0.7 g, 2.41 mmol, 96%). 1H NMR (400 MHz, DMSO-d6) δ ppm 7.71 (s, 1H), 7.00 (s, 1H), 5.61-5.67 (m, 1H), 3.87 (s, 3H), 2.98-3.07 (m, 2H), 2.60 (t, J=5.50 Hz, 2H), 2.28-2.37 (m, 4H), 2.20 (s, 3H), 1.43-1.53 (m, 2H), 0.87 (t, J=7.52 Hz, 3H).

1. washwashed with conc. NaHCO3
2. dry with materialdried (Na2SO4)
3. filtrationfiltered
4. custompurified by flash chromatography