Methanaminium, N-((dimethylamino)(3H-1,2,3-triazolo(4,5-b)pyridin-3-yloxy)methylene)-N-methyl-, hexafluorophosphate(1-) (1:1) → (-)-2-(6,7-difluoro-1H-benzimidazol-1-yl)-N-{1-[4-(1-cyano-1-methylethyl)-3-methylphenyl]ethyl}acetamide

Participants

Reaction Steps

To a solution of (6,7-difluoro-1H-benzimidazol-1-yl)acetic acid (500 mg, 2.36 mmol) prepared according to scheme 2, 2-{4-[1-aminoethyl]-2-methylphenyl}-2-methylpropanenitrile (477 mg, 2.36 mmol) prepared according to scheme 16 and DMAP (570 mg, 4.71 mmol) stirred in anhydrous DMF (4.0 mL) is added HATU (896 mg, 2.36 mmol) after 18 hours of stirring, the mixture is diluted with EtOAc (100 mL). The organic phase is washed with distilled water, dried over anhydrous MgSO4. The mixture is filtered and concentrated. The product is purified on a preparative LCMS system equipped with a Synergi Polar (4u) 21.2×50 mm column, mobile phase: A=water (0.1% TFA), B=MeCN using a short 40 to 60% B 10 min. gradient method. The pure fractions are combined the TFA neutralized with a 4N NaOH solution and then extracted with ethyl acetate which is separated dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure to provide the expected product (+) and (−)-2-(6,7-difluoro-1H-benzimidazol-1-yl)-N-{1-[4-(1-cyano-1-methylethyl)-3-methylphenyl]ethyl}acetamide (627 mg, 67%) as a white solid. 1H NMR (400 MHz, METHANOL-D4) δ ppm 1.48 (d, J=7.03 Hz, 3 H) 1.75 (s, 6H) 2.61 (s, 3H) 4.99 (q, J=7.03 Hz, 1H) 5.12 (s, 2H) 7.12-7.25 (m, 3H) 7.33 (d, J=8.20 Hz, 1H) 7.42 (ddd, J=8.89, 3.61, 1.17 Hz, 1H) 8.13 (s, 1H), MS [M+H], calcd: 397.2. found: 397.2.

Provenance & Evidence