Hydrochloric Acid → HCID 67490993, compound

Participants

Reaction Conditions

Reaction Steps

A 1.8 M solution of lithium diisopropylamide in tetrahydrofuran (4.10 mL) was added dropwise to a solution of (3S)-3-[2-(tert-butyldimethylsilyloxy)ethyl]-5-oxo-1-[(1R)-1-phenylethyl]pyrrolidine-3-carboxylic acid tert-butyl ester in tetrahydrofuran in a nitrogen atmosphere at −73° C. over 10 minutes. After stirring at the same temperature for 15 minutes, a solution of N-fluorobenzenesulfonimide (2.63 g, 8.33 mmol) in tetrahydrofuran (18 mL) was added dropwise over 15 minutes. After stirring at the same temperature for 30 minutes, a saturated ammonium chloride solution (20 mL) was added, and the mixture was heated to 0° C. The reaction solution was poured into a mixture of ethyl acetate (100 mL) and 1 mol/mL hydrochloric acid (50 mL), followed by extraction with ethyl acetate (200 mL). The organic layer was sequentially washed with a saturated sodium bicarbonate solution (50 mL) and brine (50 mL×2) and dried over anhydrous sodium sulfate. After filtration, the filtrate was concentrated under reduced pressure. Dichloromethane was added to the resulting residue to prepare a slurry, and the solid was removed by filtration. The filtrate was concentrated, and the resulting solid was removed by filtration. The filtrate was further concentrated to give 3.44 g of the crude title compound as a pale yellow oil. The resulting crude was used for the next reaction without further purification.

Provenance & Evidence