Ethanol → HCID 53694813, compound

Participants

Reaction Steps

To a solution of 15.0 g (54 mmol) of N-[(4-fluorophenyl)sulfonyl]-D-valine from Example 1a in 55 mL of anhydrous ethanol cooled in an ice bath, was slowly added 5.0 mL (8.1 g, 68 mmol) of thionyl chloride over 5 minutes. The reaction mixture was then stirred at room temperature for 28 hours, the solvents removed under reduced pressure and the residue dissolved in ethyl acetate. This was then washed with saturated sodium bicarbonate, 5% potassium hydrogen sulfate and brine, dried over sodium sulfate, filtered and concentrated to afford crude product, which was chromatographed on silica gel using 10-20% ethyl acetate/hexane to yield 12.8 g of pure N-[(4-fluorophenyl)sulfonyl]-D-valine ethyl ester, m/e=304 (M+H).

Provenance & Evidence