反应详情

NaBH4 (2.64 g, 69.8 mmol) was added carefully in portions to a suspension of 1-{1-[3-(methyloxy)-4-nitrophenyl]-4-piperidinyl}-4-[2-(methylsulfonyl)-ethyl]piperazine (9.9 g, 23.3 mmol), nickel(II)chloride hexahydrate (1.66 g, 7 mmol), MeOH (120 mL) and THF (60 mL) at 0° C. The ice bath was removed and the reaction mixture was stirred at rt overnight (˜16 h). The reaction mixture was concentrated onto silica gel and flash chromatography afforded the title compound of step B (6.24 g, 68%) as a brown solid. 1H NMR (400 MHz, DMSO-d6) δ 6.49-6.44 (m, 2H), 6.26 (dd, J=8.4, 2.6 Hz, 1H), 4.18 (bs, 2H), 3.71 (s, 3H), 3.43-3.36 (m, 2H), 3.25 (t, J=6.8 Hz, 2H), 3.00 (s, 3H), 2.65 (t, J=6.8 Hz, 2H), 2.47-2.36 (m, 4H), 2.23-2.15 (m, 1H), 1.82-1.75 (m, 2H), 1.54-1.43 (m, 2H).

1. customThe ice bath was removed
2. concentrationThe reaction mixture was concentrated onto silica gel and flash chromatography