[F:1][C:2]1[C:10]([N+:11]([O-:13])=[O:12])=[CH:9][CH:8]=[C:7]2[C:3]=1[C:4]([CH3:16])([CH3:15])[C:5](=[O:14])[NH:6]2.[CH:17]1(O)[CH2:20][CH2:19][CH2:18]1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OCC)=O)=NC(OCC)=O>C1COCC1.O>[CH:17]1([N:6]2[C:7]3[C:3](=[C:2]([F:1])[C:10]([N+:11]([O-:13])=[O:12])=[CH:9][CH:8]=3)[C:4]([CH3:16])([CH3:15])[C:5]2=[O:14])[CH2:20][CH2:19][CH2:18]1To a solution of 4-fluoro-3,3-dimethyl-5-nitro-1,3-dihydro-2H-indol-2-one (300 mg), cyclobutanol (0.136 mL) and triphenylphosphine (702 mg) in THF (15 mL) was added dropwise diethyl azocarboxylate (40% toluene solution, 1.48 mL) at 0° C., and the mixture was stirred for 5 hr under a nitrogen atmosphere. To the reaction mixture was added water at 0° C., and the mixture was extracted with ethyl acetate. The extract was washed with water and saturated brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (200 mg).
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