Lawesson's reagent → 4-(S)-(1-Ethoxycarbonylcyclopropyl)-3-(S)-fluoro-1-[1-(S)-phenylethyl]-2-pyrrolidinthione

Participants

Reaction Conditions

Reaction Steps

4-(S)-(1-Ethoxycarbonylcyclopropyl)-3-(S)-fluoro-1-[1-(S)-phenylethyl]-2-pyrrolidone (6.86 g, 21.48 mmol) was dissolved in dry toluene (100 ml). After adding Lawesson's reagent (5.21 g, 12.89 mmol), the mixture was heated at 60° C. for 30 minutes. After allowing the liquid reaction mixture to cool, toluene was evaporated under reduced pressure and the residue was subjected to flash silica gel column chromatography (eluent: n-hexane:ethyl acetate=4:1) to obtain 6.49 g (90.1%) of the title compound as a pale yellow oily substance.

Provenance & Evidence