反应详情

To a solution of 4-(5-cyano-7-isopropyl-1,3-benzoxazol-2-yl)-N-{[trans-4-(2-oxoethyl)cyclohexyl]methyl}benzamide (25 mg, 0.056 mmol) in methanol (2 ml) were added 3,5-bis(trifluoromethyl)benzylamine (20 mg, 0.082 mmol) and sodium cyanoborohydride (10 mg, 0.159 mmol). The mixture was stirred overnight at room temperature, at which point LC/MS analysis showed a new peak at the desired molecular weight. The reaction mixture was then diluted with 10 ml of saturated sodium bicarbonate solution and 10 ml of ethyl acetate. The phases were separated and the aqueous phase was extracted with 2×10 ml of ethyl acetate. The combined organics were washed with 10 ml of brine, dried (sodium sulfate), and concentrated. The residue was purified by flash chromatography on a Biotage Horizon, 25S column, eluting with 1 column volume of 100% dichloromethane followed by a gradient of 0 to 100% ethyl acetate in dichloromethane over 10 column volumes to provide the title compound (11.9 mg, 0.018 mmol, 31.5% yield). Mass spectrum (ESI) 671.5 (M+1). 1H NMR (500 MHz, CDCl3): δ 8.33 (d, J=8.5 Hz, 2H); 7.96 (d, J=8.5 Hz, 2H), 7.93 (d, J=1.5 Hz, 1H); 7.83 (s, 2H), 7.75 (s, 1H), 7.51 (s, 1H), 6.35 (br t, J=5.5 Hz, 1H), 5.30 (s, 2H), 3.85 (s, 2H), 3.48 (septet, J=6.5 Hz, 1H), 3.35 (t, J=6.5 Hz, 2H), 2.65 (t, J=6.5 Hz, 2H), 1.80 (m, 4H), 1.60 (m, 1H), 1.46 (d, J=7.0 Hz, 6H), 1.40-1.52 (m, 1H), 0.90-1.15 (m, 4H).

1. customThe phases were separated
2. extractionthe aqueous phase was extracted with 2×10 ml of ethyl acetate
3. washThe combined organics were washed with 10 ml of brine
4. dry with materialdried (sodium sulfate)
5. concentrationconcentrated
6. customThe residue was purified by flash chromatography on a Biotage Horizon, 25S column
7. washeluting with 1 column volume of 100% dichloromethane