Cl[C:2]1[C:7]([C:8]([O:10]CC)=O)=[CH:6][N:5]=[C:4]2[N:13]([CH2:16][C:17]3[CH:22]=[CH:21][C:20]([O:23][CH3:24])=[CH:19][CH:18]=3)[N:14]=[CH:15][C:3]=12.[C:25]1([NH:31][NH2:32])[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1>>[CH3:24][O:23][C:20]1[CH:19]=[CH:18][C:17]([CH2:16][N:13]2[C:4]3[NH:5][CH:6]=[C:7]4[C:8](=[O:10])[N:31]([C:25]5[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=5)[N:32]=[C:2]4[C:3]=3[CH:15]=[N:14]2)=[CH:22][CH:21]=1A suspension of compound 3 and 10 equivalents of phenyl hydrazine was stirred at 90° C. for 16 hours. Reaction was quenched with iced water. The aqueous layer was removed, residue was suspended in ethanol and stirred with 1N NaOH solution at room temperature for 1 hour. pH was adjusted to 5 using acetic acid and solvent was removed in vacuo. Compound 4 was collected by filtration.
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