[N+:1](=[C:3]([C:8](=O)[CH2:9][CH2:10][CH2:11][CH2:12][O:13][CH3:14])[C:4]([O:6][CH3:7])=[O:5])=[N-].[C:16]1([NH:22][C:23](N)=[O:24])[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1.ClCCCl.FC(F)(F)C(O)=O>C1(C)C=CC=CC=1.C([O-])(=O)C.C([O-])(=O)C.C([O-])(=O)C.C([O-])(=O)C.[Rh+4]>[CH3:14][O:13][CH2:12][CH2:11][CH2:10][CH2:9][C:8]1[N:22]([C:16]2[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=2)[C:23](=[O:24])[NH:1][C:3]=1[C:4]([O:6][CH3:7])=[O:5]Methyl 2-diazo-7-methoxy-3-oxoheptanoate (6.93 g) and 1-phenylurea (5.41 g) were suspended in toluene (30 ml)-1,2-dichloroethane (30 ml), rhodium tetraacetate (230 mg) was added and the mixture was stirred at 80° C. for 2 hr. After cooling to room temperature, trifluoroacetic acid (7.5 ml) was added and the reaction mixture was stirred at room temperature for 1 day. The reaction mixture was concentrated under reduced pressure, and the residue was subjected to silica gel column chromatography, and a fraction eluted with ethyl acetate-hexane (15:85-100:0) was concentrated under reduced pressure to give the object product (7.40 g).
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