Toluene → 2-{2-[2-(1-Carboxy-2-methyl-butylcarbamoyl)-6-fluoro-phenyldisulfanyl]-3-fluoro-benzoylamino}-3-methyl-pentanoic acid

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To a solution of [S-(R*,R*)]-2-[2-[2-(1-tert-butoxycarbonyl-2-methyl-butylcarbamoyl)-6-fluorophenyldisulfanyl]-3-fluoro- benzoylamino]-3-methylpentanoic acid tert butyl ester (0.6 g ,0.8 mmol) and anisole (1 ml) in 10 mL dichloromethane at 0° C., was added dropwise 10 mL trifluoroacetic acid. The mixture was allowed to warm to ambient temperature. After 4 hours, 5 mL toluene was added and the solvents were removed in vacuo. The crude product was recrystallized from methanol/water to yield 0.2 g of the title compound, mp 188°-190° C.

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