2,6-Lutidine → 2-(3-chloro-4-methanesulfonyl-phenyl)-3-((R)-3,3-difluoro-cyclopentyl)-N-[1-(2-hydroxy-2-methyl-propyl)-1H-pyrazol-3-yl]-propionamide

Participants

Reaction Conditions

Reaction Steps

In a round bottom flask was placed 1-(3-amino-pyrazol-1-yl)-2-methyl-propan-2-ol (prepared as in Example 80, 56 mg, 0.36 mmol), 2,6-lutidine (54 μL, 0.49 mmol) and methylene chloride (10 mL) which was then cooled to 0° C. in an ice bath. To this solution was then added dropwise a solution of 2-(3-chloro-4-methanesulfonyl-phenyl)-3-((R)-3,3-difluoro-cyclopentyl)-propionyl chloride (˜0.16 M solution, 2 mL, 0.33 mmol). The reaction was then allowed to warm up to 25° C. and stirred for 16 h. After this time the reaction mixture was quenched with a saturated aqueous sodium bicarbonate solution (10 mL) and then diluted with methylene chloride (10 mL) transferred to a separatory funnel and the layers separated. The aqueous layer was then extracted methylene chloride (3×10 mL). The organics were combined and then washed with a 1 N aqueous hydrochloric acid solution (10 mL) and then dried over magnesium sulfate, filtered and concentrated in vacuo. Purification on an AnaLogix Intelliflash system (12 g column, 55% ethyl acetate/hexanes) afforded 2-(3-chloro-4-methanesulfonyl-phenyl)-3-((R)-3,3-difluoro-cyclopentyl)-N-[1-(2-hydroxy-2-methyl-propyl)-1H-pyrazol-3-yl]-propionamide (as a mixture of two diastereomers, 90 mg, 55%) as a white foam: ES-HRMS m/e calcd for C22H28N3O4SClF2 (M+H)+ 504.1530, observed 504.1526; 1H NMR (300 MHz, DMSO-d6) δ 1.03 (s, 3H, CH3), 1.04 (s, 3H, CH3), 1.42 (m, 1H, CH), 1.68-2.33 (m, 8H, 4×CH2), 3.34 (s, 3H, SO2CH3), 3.87 (s, 2H, NCH2), 3.90 (m, 1H, ArCHCO), 4.66 (s, 1H, OH), 6.45 (d, J=2.2 Hz, 1H, Ar), 7.52 (d, J=2.2 Hz, 1H, Ar), 7.60 (d, Jo=8.3 Hz, 1 H, Ar), 7.71 (s, 1H, Ar), 8.02 (d, Jo=8.3 Hz, 1H, Ar), 10.85 (s, 1H, NH).

Provenance & Evidence