Reaction Steps
In a round bottom flask was placed (R)-2-(3-cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid (prepared in Example 114, 65 mg, 0.20 mmol), methylene chloride (2 mL) and N,N-dimethylformamide (2 drops). To this solution was then added a solution of oxalyl chloride in methylene chloride (2.0 M solution, 110 μL, 0.22 mmol). Upon addition there was gas evolution. This was stirred for 30 min at 25° C. after which time it was concentrated in vacuo. The residue was then dissolved in methylene chloride (2 mL) and added dropwise into a solution of 1-(3-amino-pyrazol-1-yl)-2-methyl-propan-2-ol (prepared as in Example 80, 29 mg, 0.19 mmol), 2,6-lutidine (46 μL, 0.40 mmol) and methylene chloride (2 mL) at 0° C. It was then allowed to warm to 25° C. and stirred for 1 h. After this time, the reaction was quenched with a small amount of methanol, diluted with methylene chloride and then concentrated with silica gel (2 g) in vacuo and purified on Biotage Flash chromatography system (40S column, silica gel, 50% ethyl acetate/hexanes to 80% ethyl acetate/hexanes) to afford (R)-2-(3-cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-[1-(2-hydroxy-2-methyl-propyl)-1H-pyrazol-3-yl]-propionamide (57 mg, 62%) as a white foam: [α]25589=−5.3° (c=0.17, methanol); ES-HRMS m/e calcd for C23H30N4O4S (M+H)+ 459.2061, observed 459.2060; 1H NMR (300 MHz, DMSO-d6) δ 1.03 (s, 3H, CH3), 1.04 (s, 3H, CH3), 1.11 (m, 2H, CH2), 1.38-1.80 (m, 8H, 4×CH2), 2.11 (m, 1H, CH), 3.36 (s, 3H, SO2CH3), 3.87 (s, 2H, NCH2), 3.99 (m, 1H, ArCHCO), 4.65 (s, 1H, OH), 6.44 (d, J=2.2 Hz, 1H, Ar), 7.51 (d, J=2.2 Hz, 1H, Ar), 7.95 (dd, Jm=1.6 Hz, Jo=8.2 Hz, 1H, Ar), 8.10 (d, Jm=1.6 Hz, 1H, Ar), 8.10 (d, Jo=8.2 Hz, 1H, Ar), 10.84 (s, 1H, NH).
