Reaction Steps
A solution of 3-cyclopentyl-2-(1,1-dioxo-2,3-dihydro-benzo[b]thiophen-5-yl)-propionic acid (114 mg, 0.37 mmol) was dissolved in methylene chloride (5 mL) and N,N-dimethylformamide (one drop) and cooled to 0° C. To this solution was added dropwise a solution of oxalyl chloride in methylene chloride (2 M solution, 212 μL, 0.43 mmol) which produced gas evolution and it was stirred at 0° C. for 15 min and it was then allowed to warm to 25° C. and stirred for 1 h. After this time, the reaction was concentrated in vacuo to ˜1.5 mL. In a separate flask, a solution of 1-(3-amino-pyrazol-1-yl)-2-methyl-propan-2-ol (prepared as in Example 80, 63 mg, 0.41 mmol), 2,6-lutidine (61 μL, 0.55 mmol) and methylene chloride (5 mL) was cooled to 0° C. in an ice bath. To this solution was added the solution of the prepared acid chloride, diluted with another portion of methylene chloride (1 mL), dropwise. After addition was complete the reaction was then allowed to warm to 25° C. and stirred for 16 hours. After this time the reaction mixture was diluted with methylene chloride (10 mL) and washed with a saturated aqueous sodium bicarbonate solution (15 mL). The aqueous layer was then extracted with methylene chloride (2×10 mL). The organic layers were then washed with a 1 N aqueous hydrochloric acid solution (10 mL) and then dried over magnesium sulfate, filtered and concentrated in vacuo. Purification using reverse phase HPLC afforded 3-cyclopentyl-2-(1,1-dioxo-2,3-dihydro-benzo[b]thiophen-5-yl)-N-[1-(2-hydroxy-2-methyl-propyl)-1H-pyrazol-3-yl]-propionamide (103 mg, 63%) as a white foam (as a racemic mixture): ES-HRMS m/e calcd for C23H31N3O4S (M+H)+ 446.2108, observed 446.2109; 1H NMR (300 MHz, DMSO-d6) δ ppm 1.03 (s, 3H, CH3), 1.04 (s, 3 H, CH3), 1.10 (m, 2H, CH2), 1.38-1.79 (m, 8H, 4×CH2), 2.07 (m, 1H, CH), 3.33 (t, J=6.8 Hz, 2H, ArCH2), 3.56 (t, J=6.8 Hz, 2H, SO2CH2), 3.86 (s, 2 H, NCH2), 3.91 (m, 1 H, ArCHCO), 4.65 (s, 1H, OH), 6.45 (d, J=2.2 Hz, 1H, Ar), 7.51 (m, 3H, Ar), 7.69 (d, Jo=8.5 Hz, 1H, Ar), 10.75 (s, 1H, NH).
