Ethyl bromoacetate → HCID 58641285, compound

Participants

Reaction Conditions

Reaction Steps

A solution of (1S)-1-cyclopropyl-2-[(2S)-4-(2,5-difluorophenyl)-2-phenyl-2,5-dihydro-1H-pyrrol-1-yl]-2-oxoethanol (22-9, 150 mg, 0.422 mmol, 1 equiv) in DMP (1 mL) was cooled to 0° C. and treated with a solution of NaH (12 mg, 0.506 mmol, 1.2 eq) in DMF (0.5 ml), then stirred for 10 min. Ethyl bromoacetate (0.078 mL, 0.46 mmol, 1.1 eq) was added to the maroon-colored reaction mixture and the resulting mixture was stirred at 0° C. for 5 min, then warmed to 23° C. and stirred for 30 min. The yellow reaction mixture was partitioned between and water (65 mL) and EtOAc (2×60 mL) and the combined organic layers were dried over sodium sulfate and concentrated. The residue was purified by reverse-phase liquid chromatography (acetonitrile/H2O with 0.1% TEA present) to afford ethyl ({(1S)-1-cyclopropyl-2-[(2S)-4-(2,5-difluorophenyl)-2-phenyl-2,5-dihydro-1H-pyrrol-1-yl]-2-oxoethyl}oxy)acetate (40-1) as a light yellow oil. 1H NMR (300, CDCl3) major rotamer: δ 7.22-7.39 (m, 5H), 6.93-7.12 (m, 3H), 6.42 (br s), 5.87 (d, 1H, J=2.4 Hz), 4.93 (br s, 2H), 4.29 (m, 2H), 3.92 (d, 1H, J=7.6 Hz), 3.66 (d, 1H, J=8.8 Hz), 3.41 (d, 1H, J=8.8 Hz), 1.18 (t, 3H, J=7.3 Hz), 0.61 (m, 4H). LRMS m/z (M+H) 442.4 found, 442.5 required.

Provenance & Evidence