Diisopropylethylamine → (S)-2-[4-(2-ethoxy-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-4-methyl-pentanoic acid (1-methyl-1H-pyrazol-3-yl)-amide

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A solution of (S)-2-[4-(2-ethoxy-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-4-methyl-pentanoic acid (prepared as in Example 81, 120 mg, 0.36 mmol) in N,N-dimethylformamide (4 mL) was treated with 1-methyl-1H-pyrazol-3-ylamine (42 mg, 0.43 mmol), benzotriazol-1-yl-oxy-tris(dimethylamino)phosphonium hexafluorophosphate (320 mg, 0.72 mmol) and N,N-diisopropylethylamine (100 mg, 0.80 mmol). The reaction mixture was stirred for 4 h at 25° C., under nitrogen. The reaction mixture was diluted with ethyl acetate, washed with saturated ammonium chloride, water, a saturated sodium chloride solution and dried over sodium sulfate. The organic layer was concentrated, and the crude product was purified by ISCO flash chromatography (Teledyne Isco RediSep Flash Column 12 g, 20% to 70% ethyl acetate/hexanes) to afford (S)-2-[4-(2-ethoxy-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-4-methyl-pentanoic acid (1-methyl-1H-pyrazol-3-yl)-amide as a waxy material. This material was dissolved in diethyl ether (4 mL) and treated with hydrogen chloride in diethyl ether (1 M, 2 mL). Solvents were evaporated and the residue was triturated with diethyl ether. The resulting mixture was filtered to give (S)-2-[4-(2-ethoxy-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-4-methyl-pentanoic acid (1-methyl-1H-pyrazol-3-yl)-amide hydrochloride (30 mg, 19%) as a brown solid: HR-ES-MS m/z calculated for C22H28N4O4 [M+Na]+ 435.2003, observed 435.2002; 1H NMR (300 MHz, DMSO-d6) δ ppm 0.87 (d, J=6.6 Hz, 3H) 0.90 (d, J=6.6 Hz, 3H) 1.24 (t, J=6.9 Hz, 3H) 1.30-1.61 (m, 2H) 1.62-1.82 (m, 1H) 3.71 (s, 3H) 3.94-4.13 (m, 3H) 4.48 (d, J=18.1 Hz, 1H) 4.72 (s, 1H) 4.86 (dd, J=10.6, 4.5 Hz, 1H) 6.37 (d, J=1.2 Hz, 1H) 6.97 (t, J=7.4 Hz, 1H) 7.17 (d, J=8.2 Hz, 1H) 7.20-7.32 (m, 2H) 7.52 (s, 1H) 10.68 (s, 1H).

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