Reaction Steps
To a solution of the above crude aldehyde (180 mg, 0.97 mmol) and 2-[4-(5,6,7,8-tetrahydro-quinolin-8-ylamino)-butyl]-isoindol-1,3-dione (372 mg, 1.06 mmol) in CH2Cl2 (10 mL) was added sodium triacetoxyborohydride (410 mg, 1.93 mmol). The reaction mixture was stirred at room temperature for 3 days. Then the solvent was removed under reduced pressure to afford a yellow oil. Purification by flash column chromatography on silica gel using 2% CH3OH/CH2Cl2 afforded the product as a yellow oil (135 mg, 27%). 1H NMR (CDCl3) δ 1.42-1.47 (m, 2H), 1.56-1.63 (m, 2H), 1.93-1.96 (m, 2H), 2.06-2.07 (m, 2H), 2.22 (t, 2H, J=6.0 Hz), 2.60-2.67 (m, 3H), 2.70 (m, 1H), 2.95 (t, 2H, J=6.0 Hz), 3.56 (t, 2H, J=6.0 Hz), 4.01 (t, 1H, J=6.0 Hz), 4.16 (ABq, 2H, J=42.0, 15.0 Hz), 4.29-4.35 (m, 1H), 4.51 (br s, 1H), 4.58-4.66 (m, 1H), 6.94 (d, 1H, J=7.2 Hz), 7.01-7.06 (m, 1H), 7.09 (t, 1H, J=8.1 Hz), 7.29 (d, 1H, J=7.5 Hz), 7.47 (d, 1H, J=8.1 Hz), 7.68-7.70 (m, 2H), 7.78-7.81 (m, 2H), 8.41 (d, 1H, J=3.9 Hz).
