4-(1-Ethoxycarbonylcyclopropyl)-3-fluoro-1-[1-(S)-phenylethyl1-3-pyrrolin-2-one → 4-(S)-(1-Ethoxycarbonylcyclopropyl)-3-(S)-fluoro-1-[1-(S)-phenylethyl]-2-pyrrolidone

Participants

Reaction Steps

To a solution of 4-(1-ethoxycarbonylcyclopropyl)-3-fluoro-1-[1-(S)-phenylethyl]-3-pyrrolin-2-one (587 mg, 1.85 mmol) in ethanol (5 ml) was added Raney nickel (R-100, 2 ml). Under a hydrogen atmosphere of 5 kg/cm2, the mixture was stirred at room temperature for 1 hour. Next, Raney nickel (R-100, 3 ml) was further added and stirring was continued under the same conditions for 2.5 hours. After eliminating the catalyst by filtering through celite (washed with ethanol), the filtrate was concentrated under reduced pressure. The residue was subjected to flash silica gel column chromatography (eluent: n-hexane:ethyl acetate=3:1) to obtain 382 mg (64.6%) of the title compound as a colorless oily substance. The 1H-NMR data of this compound agreed with the data of the compound obtained in Referential Example 10-2.

Provenance & Evidence