Sodium triacetoxyborohydride → HCID 11260625, compound

Participants

Reaction Steps

N-{2-[(2R,4S)-4-Amino-2-methylpyrrolidin-1-yl]-2-oxoethyl}-3-(trifluoromethyl)benzamide (200 mg, 0.607 mmol) and 4-hydroxy-4-pyridin-2-yl-cyclohexanone (116 mg, 0.607 mmol) were dissolved in 2-propanol (10 mL). After stirring for 30 minutes, sodium triacetoxyborohydride (257 mg, 1.21 mmol) was added and the mixture was stirred at room temperature overnight. TLC indicated complete conversion to desired products in about a 1:1 ratio of two isomers. The reaction mixture was chromatographed on silica gel eluting with dichloromethane to 10% methanol/dichloromethane/0.5% ammonium hydroxide to give 229 mg (75%) as a mixture of isomers. 1H NMR (CDCl3, mixture of isomers) δ 8.53 (m, 1H), 8.13 (bs, 1H), 8.02 (d, 1H), 7.75 (m, 2H), 7.58 (t, 1H), 7.40 (m, 2H), 7.22 (m, 1H), 4.05-4.38 (m, 3H), 3.80 (m, 1H), 3.56 (m, 1H), 3.42 (m, 1H), 3.19 (m, 1H), 3.04 (m, 1H), 2.65 (m, 1H), 2.47 (m, 1H), 2.16 (m, 2H), 1.40-2.00 (m, 7H), 1.43 (d, 3H). LCMS (M+H)+: Higher Rf isomer m/z 505.2; Lower Rf isomer m/z=505.2.

Provenance & Evidence