Acetic Anhydride → HCID 90060220, compound

Participants

Reaction Conditions

Reaction Steps

tert-Butyl (E)-(2S,3S)-3-[(S)-2-(4-but-2-ynyloxy-phenyl)-1-ethoxycarbonyl-ethylcarbamoyl]-2-hydroxy-2-(2-hydroxy-ethyl)-12-oxo-nonadec-4-enoate (3.22 g, 4.51 mmol) was dissolved in dichloromethane (64 mL), and the mixture was then cooled to 0° C. in an ice bath. Acetic anhydride (1.07 mL, 11.3 mmol), triethylamine (0.63 mL, 4.52 mmol), and dimethylaminopyridine (55.1 mg, 0.451 mmol) were added in this order, and the mixture was then stirred at 0° C. for 1.5 hours. The mixture was quenched with water (46 mL), and then extracted with dichloromethane (46 mL). The organic layer was washed with a saturated aqueous solution (33 mL) of sodium chloride, then dried over anhydrous sodium sulfate, and filtered. The solvent was distilled off under reduced pressure. The residue was purified on Biotage (silica gel, n-hexane/ethyl acetate) to obtain 2.65 g (3.51 mmol, 78% yield) of No. 5328456.

Provenance & Evidence