(R)-3-benzylsulfanyl-2-{[5-[4-(N-hydroxycarbamimidoyl)phenyl]-2-(4-trifluoromethylphenyl)oxazole-4-carbonyl]amino}propionic acid methyl ester 、 在
silica gel 、 ethyl acetate hexanes 作用下,
以
三氟乙酸酐 为溶剂,
反应 0.5h,
以gave 9 mg (8%) of the title compound的产率得到(R)-3-benzylsulfanyl-2-{[5-[4-(5-trifluoromethyl[1,2,4]oxadiazol-3-yl)phenyl]-2-(4-trifluoromethylphenyl)oxazole-4-carbonyl]amino}propionic acid methyl ester