1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → (2S,4R)-tert-butyl 4-fluoro-2-((R)-1-(3-fluoro-5-(1,1,2,2-tetrafluoroethoxy)phenyl)-1-(4-fluorophenyl)-2-phenylethylcarbamoyl)pyrrolidine-1-carboxylate

Participants

Reaction Steps

To a solution of (R)-1-(3-fluoro-5-(1,1,2,2-tetrafluoroethoxy)phenyl)-1-(4-fluorophenyl)-2-phenylethanamine (42 mg, 0.1 mmol), prepared as described in Procedure 3, 4, 5 and 6, and (2S,4R)-1-(tert-butoxycarbonyl)-4-fluoropyrrolidine-2-carboxylic acid (23 mg, 0.1 mmol) in CH2Cl2 (1 mL) was added EDCI (25 mg, 0.1 mmol) and DMAP (16 mg, 0.1 mmol). The reaction mixture was stirred overnight and concentrated to dryness under a stream of argon. The resulting residue was dissolved in MeOH and purified by preparative HPLC (Phenoma Luna AXIA 10A, C18, eluting with 10-90% MeCN/H2O containing 0.1% TFA, monitoring at 220 nm) to provide (2S,4R)-tert-butyl 4-fluoro-2-((R)-1-(3-fluoro-5-(1,1,2,2-tetrafluoroethoxy)phenyl)-1-(4-fluorophenyl)-2-phenylethylcarbamoyl)pyrrolidine-1-carboxylate (40 mg, 64% yield) as a white solid. 1H NMR (500 MHz, CDCl3) δ ppm 8.30 (s, 1H), 7.13-7.03 (m, 5H), 6.95-6.90 (m, 2H), 6.80-6.78 (m, 2H), 6.70 (bs, 1H), 6.51-6.47 (m, 2H), 5.88-5.67 (m, 1H, —CF2H), 5.10 (app d, J=50 Hz, 1H, —CFH), 4.48-4.45 (m, 1H), 3.89-3.78 (m, 2H), 3.70 (d, J=10 Hz, 1H0, 3.29-3.18 (m, 1H), 2.79-2.55 (m, 2H), 2.25-2.11 (m, 1H), 1.32 (s, 9H); LC/MS: RT=3.746 min [M+H] 641.2 Phenomenex Luna C18 column, 4.6×50 mm eluting with 10-90% MeCN/H2O over 4 minutes containing 0.1% NH4OAc; 4 mL/min, monitoring at 220 nm.

Provenance & Evidence