[NH2:1][C:2]1([CH3:19])[C:14]2[N:13]3[CH:15]=[CH:16][N:17]=[C:12]3[C:11](=[O:18])[NH:10][C:9]=2[C:8]2[CH:7]=[CH:6][CH:5]=[CH:4][C:3]1=2.CO[CH:22]1[CH2:26][CH2:25][CH:24](OC)O1>C(O)(=O)C.O>[CH3:19][C:2]1([N:1]2[CH:22]=[CH:26][CH:25]=[CH:24]2)[C:14]2[N:13]3[CH:15]=[CH:16][N:17]=[C:12]3[C:11](=[O:18])[NH:10][C:9]=2[C:8]2[CH:7]=[CH:6][CH:5]=[CH:4][C:3]1=2To a solution of 1.3 g of 10-amino-10-methyl-5H,10H-imidazo[1,2-a]indeno[1,2-e]pyrazin-4-one in 25 ml of acetic acid is added 0.66 g of 2,5-dimethoxytetrahydrofuran. The mixture is stirred at boiling for 1 hour, cooled to 20° C. and concentrated to dryness under reduced pressure (15 mmHg; 2 kPa) at 60° C. The product obtained is suspended in 100 ml of distilled water and the insoluble product formed is isolated by filtration, washed successively 4 times with 40 ml in total of distilled water, 3 times with 30 ml in total of methanol and 3 times with 30 ml in total of acetone, and then dried under reduced pressure (1 mmHg; 0.13 kPa) at 100° C. 0.82 g of 10-methyl-10-(1-pyrrolyl)-5H,10H-imidazo[1,2-a]indeno[1,2-e]pyrazin-4-one is thus obtained, melting at 320° C. (decomposition) (Analysis, % calculated C: 71.51, H: 4.67, N: 18.53, O: 5.29, % found C: 71.7, H: 4.5, N: 18.3).
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