Formaldehyde → HCID 44178157, compound

Participants

Reaction Steps

Into an 8 mL vial was weighed 20.7 mg (40 μmol) of 1-(3′-(methylsulfonyl)biphenyl-4-yl)-4-((R)-pyrrolidin-2-yl)-2-(2-(trifluoromethyl)phenyl)-1H-imidazole. The material was dissolved in MeOH (400 μL) and HOAc (100 μL). The solution was treated with 20 μL (240 μmol) of 37% aqueous formaldehyde solution, and then 8 mg (125 μmol) of sodium cyanoborohydride was added at ambient temperature. After stirring for 15 minutes at ambient temperature LC/MS analysis of the reaction showed complete conversion to product. The reaction solution was directly injected into the reverse phase preparative HPLC and eluted with acetonitrile/water. (Phenomenex Axia Gemini C18 30×100 mm 5 μm, A=H2O with 0.1% trifluoroacetic acid, B=acetonitrile with 0.1% trifluoroacetic acid, 17 minute gradient from 10% B to 100% B at 35 mL/minute). Product fractions were combined, made basic by the addition of sat. NaHCO3, and concentrated in vacuo to remove the acetonitrile. The resulting basic aqueous was extracted with CH2Cl2 (3×), and the organics were dried over Na2SO4, filtered and concentrated in vacuo. The resulting 4-((R)-1-methylpyrrolidin-2-yl)-1-(3′-(methylsulfonyl)biphenyl-4-yl)-2-(2-(trifluoromethyl)phenyl)-1H-imidazole was isolated as a white foam, yield: 16.9 mg (79%); 1H NMR (400 MHz, CDCl3): δ 8.10-8.07 (m, 1H), 7.93-7.90 (m, 1H), 7.83-7.79 (m, 1H), 7.72-7.68 (m, 1H), 7.64 (t, J=7.8 Hz, 1H), 7.54-7.48 (m, 4H), 7.43-7.38 (m, 1H), 7.27-7.18 (m, 4H), 3.41-3.30 (m, 1H), 3.28-3.20 (m, 1H), 3.08 (s, 3H), 2.44 (s, 3H), 2.41-2.26 (m, 2H), 2.13-1.94 (m, 2H), 1.90-1.79 (m, 1H); MS (ES): 526.5 [M+H]+.

Provenance & Evidence