Methyl Acrylate → (S)-methyl 3-(3-(tert-butoxycarbonylamino)-2-oxoazepan-1-yl)propanoate

Participants

Reaction Steps

To a round bottom flask was added (S)-tert-butyl 2-oxoazepan-3-ylcarbamate (500 mg, 2.19 mmol), THF (10 mL) and a 6 M solution of LiHMDS in THF (0.475 mL, 2.85 mmol). The reaction was stirred at rt for 1 hr before it was cooled to 0° C. Then, methyl acrylate (0.237 mL, 2.63 mmol) was added to the reaction and the reaction was slowly warmed up to rt and stirred at rt overnight. The reaction was concentrated and purified using RP prep-HPLC (Method A) to give (S)-methyl 3-(3-(tert-butoxycarbonylamino)-2-oxoazepan-1-yl)propanoate (140 mg, 0.445 mmol, 20.3% yield) as a white solid. Anal. Calcd. for C15H26N2O5 m/z 314.3. found: 315.2 (M+H)+; 1H NMR (500 MHz, CDCl3) δ ppm 5.96 (d, J=5.5 Hz, 1H), 4.34 (dd, J=11.0, 6.0 Hz, 1H), 3.77 (ddd, J=13.6, 6.7, 6.6 Hz, 1H), 3.69 (s, 3H), 3.61 (ddd, J=13.9, 7.1, 7.0 Hz, 1H), 3.57-3.47 (m, 1H), 3.33 (dd, J=14.8, 4.4 Hz, 1H), 2.65-2.50 (m, 2H), 2.04 (d, J=13.2 Hz, 1H), 1.94 (d, J=13.7 Hz, 1H), 1.88-1.74 (m, 2H), 1.50-1.40 (m, 9H), 1.41-1.25 (m, 2H); 13C NMR (126 MHz, CDCl3) δ ppm 173.15, 172.24, 155.16, 79.35, 53.34, 51.80, 49.88, 45.50, 32.51, 28.39, 27.86, 27.74.

Provenance & Evidence