Water → HCID 67460212, compound

Participants

Reaction Steps

To a suspension of magnesium (736 mg) in tetrahydrofuran (20 mL), 1-bromo-2,4-difluorobenzene (3.42 mL) was added dropwise at 45° C. over five minutes, and the reaction solution was stirred at room temperature for one hour. This solution was added dropwise to a solution of (R)-5-oxopyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester 2-ethyl ester (6.0 g) in tetrahydrofuran (50 mL) at −40° C. over 20 minutes, and the reaction solution was stirred at −40° C. to 0° C. for one hour. Water was added to the solution in small portions at 0° C., followed by extraction with ethyl acetate. The extract was washed with brine, dried over anhydrous magnesium sulfate, and then concentrated under reduced pressure. The residue was purified by silica gel column chromatography (heptane-ethyl acetate system) to obtain 7.5 g of the title compound as a colorless oil.

Provenance & Evidence