Pyridine → HCID 86621600, compound

Participants

Reaction Steps

Acetyl chloride (0.39 mL, 5.5 mmol) and (1R,2R)-2-hydroxy-1-methylpropyl (2S)-2-[(tert-butoxy)carbonylamino]-3-[3,4-bis(phenylmethoxy)phenyl]propanoate (32) (2.0 g, 3.6 mmol) were dissolved in 25 mL of anhydrous dichloromethane. A solution of pyridine (0.5 mL, 5.5 mmol) in dichloromethane was added dropwise at 0° C. The mixture was stirred at room temperature for 2 hours. The product was extracted with dichloromethane, washed with 5% NaHCO3, 10% citric acid, and dried over Na2SO4. After concentration and drying under vacuum, the crude product (33) (2.0 g, 95% yield) was isolated and used in the next reaction without further purification. 1H NMR (400 MHz, CDCl3): δ 1.11 (d, J=6.4 Hz, 3H), 1.15 (d, J=6.4 Hz, 3H), 1.43 (s, 9H), 2.05 (s, 3H), 2.95 (dd, J=13.6, 6.4 Hz, 1H), 3.00 (dd, J=13.6, 6.4 Hz, 1H), 4.50 (dd, J=13.6, 6.4 Hz, 1H), 4.93 (m, 2H), 4.98 (d, 1H, NH), 5.12 (s, 4H), 6.66 (dd, J=8.0, 2.0 Hz, 1H), 6.77 (d, J=2.0 Hz, 1H), 6.84 (d, J=8.0 Hz, 1H), 7.29-7.45 (m, 10H).

Provenance & Evidence