反应详情

Combine 6-[4-(2-Methylamino-ethyl)-phenoxy]-nicotinamide (135 mg, 0.5 mmol), benzaldehyde (53 μL, 0.52 mmol), sodium triacetoxyborohydride (0.21 g, 1.0 mmol), acetic acid (30 μL, 0.52 mmol), tetrahydrofuran (1 mL), and 1,2-dichloroethane (5 mL) then stir at room temperature for 18 hours. Dilute the reaction with saturated aqueous sodium bicarbonate solution and extract with ethyl acetate (3×50 mL). Dry the combined ethyl acetate extracts with sodium chloride/magnesium sulfate, filter, and concentrate on a rotary evaporator to yield 200 mg of the crude product. The crude product is purified by flash column chromatography on silica gel eluting with (0.5% conc. ammonium hydroxide/5% ethanol) to (1% conc. ammonium hydroxide/10% ethanol) in chloroform to yield 6-{4-[2-(benzyl-methyl-amino)-ethyl]-phenoxy}-nicotinamide (106 mg, 0.29 mmol): m/z=362.07 (M+1); 1H NMR (CDCl3, 300.00 MHz): 8.58 (s, 1H); 8.16 (dd, 3.0 Hz, 1H); 7.33-7.22 (m, 7H); 7.05 (d, 2H); 6.95 (d, 1H); 5.86 (br s, 2H); 3.63 (s, 2H), 2.89-2.72 (m, 4H); 2.34 (s, 3H), HPLC=100% (5/95 to 95/5 ACN/(0.1% TFA in water) over 10 minutes, Zorbax® SB-Phenyl 4.6 mm×15 cm×5 micron, λ=254 nM.

1. additionDilute
2. extractionextract with ethyl acetate (3×50 mL)
3. dry with materialDry the combined ethyl acetate
4. filtrationfilter
5. concentrationconcentrate on a rotary evaporator
6. customto yield 200 mg of the crude product
7. customThe crude product is purified by flash column chromatography on silica gel eluting with (0.5% conc. ammonium hydroxide/5% ethanol) to (1% conc. ammonium hydroxide/10% ethanol) in chloroform