反应详情

To a solution of (3S)-1-(3-[3-(trifluoromethyl)phenyl]-4,5-dihydroisoxazol-5-ylcarbonyl)pyrrolidin-3-amine hydrochloride (178 mg, 0.489 mmol) and 4-hydroxy-4-pyridin-2-yl-cyclohexanone (95.1 mg, 0.498 mmol) in methylene chloride (6 mL) was added triethylamine (50.3 mg, 0.498 mmol) and then NaBH(OAc)3 (120 mg, 0.54 mmol). After being stirred at room temperature for 2 h, the reaction mixture was neutralized with 1 N NaOH to pH 7, and extracted with ethyl acetate (2×25 mL). The organic extracts were combined, washed with saline solution (20 mL), dried over sodium sulfate, concentrated in vacuo, and chromatographed on silica gel, eluting with 1% NH4OH in ethyl acetate/methanol (95/5 to 80/20). The appropriate fractions were combined and concentrated in vacuo to give two fractions of the desired compounds: peak 1 (100 mg) and peak 2 (85 mg). Both fractions were further purified by HPLC on a C18 column, eluting with 1% NH4OH in water/acetonitrile, to give peak 1 (68 mg) and peak 2 (65 mg) as white solids. Both compounds have LCMS: (M+H)+ 503.3. Peak 1 shows two peaks in a 1 to 1 ratio in a chiral analytical column. Peak 2 shows two peaks in a 1 to 10 ratio in a chiral analytical column.

1. extractionextracted with ethyl acetate (2×25 mL)
2. washwashed with saline solution (20 mL)
3. dry with materialdried over sodium sulfate
4. concentrationconcentrated in vacuo
5. customchromatographed on silica gel
6. washeluting with 1% NH4OH in ethyl acetate/methanol (95/5 to 80/20)
7. concentrationconcentrated in vacuo