[N:1]1[CH:6]=[CH:5][C:4](C2C=C(C(O)=O)C(=CC=2)C(O)=O)=[CH:3][CH:2]=1.C(O[C:22](=[O:35])[C:23]1[CH:33]=[CH:32][C:31](Br)=[C:25]([C:26]([O:28][CH2:29][CH3:30])=[O:27])[CH:24]=1)C.N1C=CC(B(O)O)=CC=1.[Li]N1C(C)(C)CCCC1(C)C>C1COCC1>[O:35]=[C:22]1[C:3]2[CH:2]=[N:1][CH:6]=[CH:5][C:4]=2[C:33]2[CH:32]=[CH:31][C:25]([C:26]([O:28][CH2:29][CH3:30])=[O:27])=[CH:24][C:23]1=29-Oxo-9H-indeno[2,1-c]pyridine-7-carboxylic acid was obtained by allowing 4-pyridin-4-ylphthalic acid [FAB: 244 (M+H)+] which had been synthesized by carrying out the same operations of Reference Examples 27 and 28 using 4-bromoisophthalic acid diethyl ester and 4-pyridine boronic acid to undergo the reaction with lithium 2,2,6,6-tetramethylpiperidide at 0° C. in THF. By carrying out reaction of this compound by the same method of Reference Example 30, ethyl 9-oxo-9H-indeno[2,1-c]pyridine-7-carboxylate was obtained. FAB: 254 (M+H)+.
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