Acetic Anhydride → (S)-1-[(R)-5-(4-cyano-benzyl)-7-(3,5-dichloro-phenyl)-5-methyl-6-oxo-6,7-dihydro-5H-imidazo[1,2-a]imidazole-3-sulfonyl]-pyrrolidine-2-carboxylic acid acetyl-amide

Participants

Reaction Conditions

Reaction Steps

(S)-1-[(R)-5-(4-Cyano-benzyl)-7-(3,5-dichloro-phenyl)-5-methyl-6-oxo-6,7-dihydro-5H-imidazo[1,2-a]imidazole-3-sulfonyl]-pyrrolidine-2-carboxylic acid amide (98 mg, 0.17 mmol) was dissolved in acetic anhydride (3 mL, 0.05 M). The reaction was heated to 100° C. for 18 h. The mixture was concentrated, toluene added, and the mixture concentrated again. The residue was chromatographed over silica with a solvent system of 10% MeOH in methylene chloride to provide 19 mg of the title compound as a white solid (M+1, 615).

Provenance & Evidence