Reaction Steps
A solution of 2-(pyrimidin-2-ylsulfanyl)-phenylamine (AMR01106, 100 mg, 0.492 mmol), 1-acetylpiperidone (69.5 mg, 0.492 mmol) and acetic acid (0.15 mL, 2.46 mmol) in DCE (2 mL) was treated with NaBH(OAc)3 (261 mg, 1.23 mmol) and stirred under microwave irradiation for 15 min at 100° C. The reaction mixture was diluted with DCM (10 mL) and quenched with saturated NaHCO3 solution. The aqueous layer was washed with DCM (2×20 mL), and the combined organic layers were dried (MgSO4), filtered and evaporated to dryness. Column chromatography on silica gel of the crude product using AcOEt/MeOH 98:2 as eluent gave 1-{4-[2-(pyrimidin-2-ylsulfanyl)-phenylamino]-piperidin-1-yl}-ethanone 36 mg, 22%) as a colorless oil. 1H NMR (270 MHz, CDCl3) δ 1.20-1.40 (2H, m, CH2), 1.90-2.10 (2H, m, CH2), 2.05 (3H, s, CH3), 2.89 (1H, m, ½CH2), 3.18 (1H, m, ½CH2), 3.54-3.74 (2H, m, CH2), 4.26 (1H, m, CH), 4.75 (1H, br s, NH), 6.69-6.75 (2H, m, ArH), 6.97 (1H, t, J=4.7 Hz, Pyrimidine-H), 7.33 (1H, m, ArH), 7.49 (1H, dd, J=7.4, 1.7 Hz, ArH) and 8.47 (2H, d, J=4.7 Hz, Pyrimidine-H), 13C NMR (270 MHz, CDCl3) δ 21.57 (CH3), 31.74, 32.56, 40.14, 45.00 (CH2), 49.63 (CH), 111.45, 111.57, 117.35, 132.12, 138.13, 148.49, 157.88 (ArC and Pyridine-C), and 171.77 (C═O).
