[CH2:1]([NH:3][C:4]1[O:5][CH2:6][C:7](=[O:14])[C:8]=1[C:9]([O:11][CH2:12][CH3:13])=[O:10])[CH3:2].[NH:15]1[C:23]2[C:18](=[CH:19][CH:20]=[CH:21][N:22]=2)[C:17]([CH:24]=O)=[CH:16]1.[ClH:26]>C(O)C>[ClH:26].[NH:15]1[C:23]2=[N:22][CH:21]=[CH:20][CH:19]=[C:18]2[C:17]([CH:24]=[C:6]2[O:5][C:4]([NH:3][CH2:1][CH3:2])=[C:8]([C:9]([O:11][CH2:12][CH3:13])=[O:10])[C:7]2=[O:14])=[CH:16]1To a solution of ethyl 2-(ethylamino)-4-oxo-4,5-dihydrofuran-3-carboxylate (0.033 g, 0.17 mmol) which similarly prepared according to the procedure described in the Example 2, First step and 7-azaindole-3-carboxaldehyde (0.024 g, 0.17 mmol) in ethanol (1.5 mL), 2M hydrochloric acid in ethanol (0.17 mL, 0.34 mmol) was added at ambient temperature. The mixture was refluxed for 4 h. Cooled to ambient temperature, the precipitate was collected by filtration, washed with ethanol and diisopropyl ether then dried to afford the titled compound (0.026 g, y. 42%).
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