反应详情

To a solution of nickel (II) chloride hexahydrate (0.58 g, 2.5 mmol) and N,N-dimethyl-1-[3-(methyloxy)-4-nitrophenyl]-4-piperidinamine (1.37 g, 4.90 mmol) in MeOH (25 mL) cooled to 0° C. was added NaBH4 (280 mg, 7.4 mmol) slowly to avoid foaming. When TLC indicated the consumption of starting material, the solution was concentrated to a purple residue. The purple residue was taken up in EtOAc and filtered through a pad of celite. The yellow filtrate was concentrated onto silica gel and purified by flash column chromatography to give the title compound of step B (0.88 g, 74%). 1H NMR (400 MHz, DMSO-d6) δ 6.48-6.45 (m, 2H), 6.26 (dd, J=8.2 and 2.2 Hz, 1H), 4.17 (br s, 2H), 3.70 (s, 3H), 3.38 (d, J=12.4 Hz, 2H), 2.49-2.43 (m under DMSO peak, 2H), 2.16 (s, 6H), 2.11-2.04 (m, 1H), 1.78 (d, J=12.4 Hz, 2H), 1.50-1.40 (m, 2H).

1. customthe consumption of starting material
2. concentrationthe solution was concentrated to a purple residue
3. filtrationfiltered through a pad of celite
4. concentrationThe yellow filtrate was concentrated onto silica gel
5. custompurified by flash column chromatography