反应详情

To 4-[3-(ethyloxy)-4-nitrophenyl]-1-propylpyridinium acetate (0.84 g, 2.42 mmol) in 25 mL of MeOH at 0° C. was added, NaBH4 (0.275 g, 7.28 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. NaHCSO3, dried (Na2SO4), filtered, rotovaped down, and purified by flash chromatography to give the title compound of step D (0.536 g, 1.85 mmol, 76%). 1H NMR (400 MHz, DMSO-d6) δ ppm 7.80 (d, J=8.61 Hz, 1H), 7.23 (d, J=1.46 Hz, 1H), 7.11 (dd, J=8.42, 1.65 Hz, 1H), 6.37 (t, J=3.57 Hz, 1H), 4.23 (q, J=6.96 Hz, 2H), 3.06 (d, J=3.11 Hz, 2H), 2.58 (t, J=5.59 Hz, 2H), 2.44-2.50 (m, 2H), 2.29-2.35 (m, 2H), 1.41-1.51 (m, J=7.36, 7.36, 7.36, 7.36, 7.36 Hz, 2H), 1.31 (t, J=6.96 Hz, 3H), 0.85 (t, J=7.33 Hz, 3H).

1. washwashed with conc. NaHCSO3
2. dry with materialdried (Na2SO4)
3. filtrationfiltered
4. custompurified by flash chromatography