反应详情

2-Cyclopentyl-4-(3-(dimethylamino)prop-1-ynyl)-5-nitrophenyl methyl carbonate (800 mg, 2.31 mmol) was dissolved in a mixture of glacial acetic acid (10 mL) and water (2.5 mL). Zn dust (1511 mg, 23.10 mmol) was added at room temperature. The solution was stirred for 10 min then diluted with methanol (5 mL) and filtered. The solution was concentrated and redissolved in ethyl acetate. The ethyl acetate solution was washed with 50% saturated NaHCO3 (2×20 mL) and brine, dried over Na2SO4, filtered, and dried down to a light orange solid. Purification by silica gel chromatography (5-15% methanol/dichloromethane) provided 5-amino-2-cyclopentyl-4-(3-(dimethylamino)prop-1-ynyl)phenyl methyl carbonate as a light orange oil (420 mg, 57% yield). 1H NMR (400.0 MHz, DMSO-d6) 7.07 (s, 1H), 6.47 (s, 1H), 5.31 (s, 2H), 3.83 (d, J=5.7 Hz, 3H), 3.48 (d, J=4.6 Hz, 2H), 2.86-2.81 (m, 1H), 2.23 (s, 6H), 1.87-1.80 (m, 2H), 1.74-1.66 (m, 2H), 1.62-1.55 (m, 2H), 1.45-1.38 (m, 2H).

1. filtrationfiltered
2. concentrationThe solution was concentrated
3. dissolutionredissolved in ethyl acetate
4. washThe ethyl acetate solution was washed with 50% saturated NaHCO3 (2×20 mL) and brine
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. customdried down to a light orange solid
8. customPurification by silica gel chromatography (5-15% methanol/dichloromethane)