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

Participants

Reaction Steps

To a solution of (6-chloro-7-fluoro-1H-benzimidazol-1-yl)acetic acid (100 mg, 0.44 mmol) prepared according to scheme 13, (S) (−)-2-{4-[1-aminoethyl]phenyl}-2-methylpropanenitrile (88.5 mg 0.44 mmol) prepared according to scheme 20 or 21 and DMAP (106 mg, 0.88 mmol) stirred in anhydrous DMF (2.0 mL) is added HATU (166 mg, 0.44 mmol) after 18 hours of stirring, the mixture is diluted with methanol (200 μL) the solution is purified directly 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 (S)-(−)-2-(6-chloro-7-fluoro-1H-benzimidazol-1-yl)-N-{1-[4-(1-cyano-1-methylethyl)-3-methylphenyl]ethyl}acetamide (290 mg, 53%) as a clear solid. 1H NMR (400 MHz, METHANOL-D4) δ ppm 1.50 (d, J=7.03 Hz, 3H) 1.69 (s, 6H) 5.03 (q, J=7.01 Hz, 1H) 5.07-5.18 (m, 2H) 7.29 (dd, J=9.37, 6.64 Hz, 3H) 7.39 (d, J=8.59 Hz, 2H) 7.44 (d, J=9.37 Hz, 1H) 7.48 (d, J=8.59 Hz, 2H) 8.14 (s, 1H) MS [M+H], calcd: 399.1. found: 399.2, [α]D=−138° (C=0.5 METHANOL)

Provenance & Evidence