Acetic Acid → 6-(2-Benzyl-1,2,3,4-tetrahydroisoquinolin-7-yloxy)nicotinamide

Participants

Reaction Steps

Combine 6-(1,2,3,4-tetrahydro-isoquinolin-7-yloxy)-nicotinamide (94 mg, 0.35 mmol), benzaldehyde (37 μL, 0.37 mmol), sodium triacetoxyborohydride (96 mg 0.46 mmol), acetic acid (21 μL, 0.37 mmol), 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 5% methanol in dichloromethane (3×25 mL). Dry the combined 5% methanol in dichloromethane extracts with sodium chloride/magnesium sulfate, filter, and concentrate on a rotary evaporator to yield 100 mg of the crude product. The crude product is purified by flash column chromatography on silica gel eluting with 1% conc. ammonium hydroxide/10% ethanol in chloroform to yield 6-(2-benzyl-1,2,3,4-tetrahydro-isoquinolin-7-yloxy)-nicotinamide 2039910 (30 mg, 0.09 mmol): m/z=360.12 (M+1); 1H NMR (CDCl3, 300.00 MHz): 8.50 (d, 1H); 8.09-8.05 (m, 1H); 7.34-7.20 (m, 5H); 7.09 (d, 1H); 6.87-6.82 (m, 2H); 6.71 (d, 1H); 5.80 (s, 2H); 3.63-3.57 (m, 4H); 2.87-2.69 (m, 4H), HPLC=96%@2.98 m (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).

Provenance & Evidence