Ethyl Acetate → HCID 89533661, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 2.64 g (10 mmol, 1 eq) of methyl (R)-1-(3-amino-2-hydroxybenzoyl)pyrrolidine-2-carboxylate and 2.84 g (20 mmol, 2.0 eq) of 3,4-dimethoxy-3-cyclobutene-1,2-dione in 80 ml of ethanol was heated at 50° C. for four and a half hours. The residue was taken up with ethyl acetate and washed three times with a 1 M aqueous sodium dihydrogen phosphate solution. The organic phase was dried over anhydrous sodium sulfate, filtered and evaporated. The oil was chromatographed on silica gel (300 g prepacked column) eluted with heptane/ethyl acetate (gradient). 1.27 g of methyl (R)-1-[2-hydroxy-3-(2-methoxy-3,4-dioxocyclobut-1-enylamino)benzoyl]pyrrolidine-2-carboxylate were obtained in the form of white solid. Yield=34%.

Provenance & Evidence