Acetic Acid → HCID 178477632, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of (S)-N-((5-(ethylsulfonyl)pyridin-2-yl)methyl)-7-isopropyl-6,7-dihydro-5H-pyrrolo[3,4-b]pyridine-3-carboxamide (3.6 g, 9.25 mmol), trans-4-(trifluoromethyl)cyclohexane-1-carbaldehyde (3.3 g, 18.5 mmol) in anhydrous MeOH (100 mL) was added acetic acid dropwise until the pH was between 6 and 7. Sodium cyanoborohydride (1.7 g, 27.75 mmol) was added portionwise at rt. The mixture was heated to 70° C. for 1 h. Upon completion, the reaction mixture was cooled to rt and concentrated under reduced pressure. The residue was dissolved in ethyl acetate (100 mL), then the organic phase was washed with water (3×100 mL) and brine (100 mL). The organic layer was dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure. The residue was purified by silica gel chromatography (eluting with 50% EtOAc in hexanes, gradient to 100%), then further purified by a chiral column using the following conditions: instrument: Berger MultiGram™ SFC, Mettler Toledo Co, Ltd; column: AD 300 mm×50 mm, 10 μm; mobile phase: A: supercritical CO2, B: iPrOH (0.05% diethylamine), A:B=60:40 at 200 mL/min; column temp: 38° C.; nozzle pressure: 100 bar; nozzle temp: 60° C.; evaporator temp: 20° C.; trimmer temp: 25° C.; wavelength: 220 nm. Isomer SFC tR=2.28 min in 12 min chromatography was isolated as the major isomer, which was then further purified by reverse-phase HPLC to give (S)-N-((5-(ethylsulfonyl)pyridin-2-yl)methyl)-7-isopropyl-6-((trans-4-(trifluoromethyl)cyclohexyl)methyl)-6,7-dihydro-5H-pyrrolo[3,4-b]pyridine-3-carboxamide (2, HCl salt) as a light yellow solid. LC-MS tR=0.69 min in 1 min chromatography, MS (ESI) m/z 553.1 [M+H]+. 1H NMR (CD3OD, 400 MHz): δ 9.12 (s, 1H), 9.01 (d, J=2.0 Hz, 1H), 8.36-8.32 (m, 2H), 7.75 (d, J=8.0 Hz, 1H), 5.16 (d, J=15.6 Hz, 1H), 4.89-4.87 (m, 2H), 4.73 (d, J=15.2 Hz, 1H), 3.42-3.34 (m, 3H), 3.31-3.28 (m, 2H), 2.58-2.51 (m, 1H), 2.20-1.90 (m, 6H), 1.50-1.39 (m, 2H), 1.33 (d, J=7.2 Hz, 3H), 1.26 (t, J=7.2 Hz, 3H), 1.24-1.20 (m, 2H), 1.10 (d, J=6.8 Hz, 3H). HCl preparative HPLC method mobile phase A: water with 0.05% HCl; mobile phase B: CH3CN; flow rate: 80 mL/min; detection: UV 220 nm/254 nm; column: Phenomenex Gemini C18 (250 mm×50 mm×5 μm); column temperature: 30° C.

Provenance & Evidence