Methanol → (R)-3-[N-(3-fluoro-5-(trifluoromethyl)benzoyl)glycyl]amino-1-(3,5-dimethylisoxazol-4-ylmethyl)pyrrolidine

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A solution of 3-fluoro-5-(trifluoromethyl)benzoyl chloride (0.058 mmol) in dichloromethane (1 mL) was added to a mixture of (R)-1-(3,5-dimethylisoxazol-4-ylmethyl)-3-(glycylamino)pyrrolidine (0.050 mmol) and piperidinomethylpolystyrene (58 mg) in chloroform (0.2 mL) and dichloromethane (0.75 mL). After the reaction mixture was stirred at room temperature for 2 h, methanol (1.0 mL) was added and the mixture was stirred at room temperature for 30 min. The reaction mixture was loaded onto Varian™ SCX column, and washed with CH3OH (16 mL). Product was eluted off using 2 N NH3 in CH3OH (6 mL) and concentrated to afford (R)-3-[N-(3-fluoro-5-(trifluoromethyl)benzoyl)glycyl]amino-1-(3,5-dimethylisoxazol-4-ylmethyl)pyrrolidine (Compound No. 1191) (19.5 mg, 88%): The purity was determined by RPLC/MS (100%); ESI/MS m/e 443.2 (M++H, C20H22F4N4O3).

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