Acetic Acid → ethyl 7-chloro-4,5-dihydro-4-oxo-10H-imidazo[1,2-a]indeno[1,2-e]pyrazine-2-carboxylate

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The procedure is as in Example 1 but starting from 5 g of diethyl 1-(6-chloro-1-oxoindan-2-yl)imidazole-2,4-dicarboxylate, 118 g of ammonium acetate and 190 ml of acetic acid. After washing the precipitate with water and then with methyl ethyl ketone, the solid obtained is first of all ground in acetonitrile and then in methanol and finally in acetone to obtain 2.7 g of ethyl 7-chloro-4,5-dihydro-4-oxo-10H-imidazo[1,2-a]indeno[1,2-e]pyrazine-2-carboxylate in the form of a brown solid melting above 260° C. (analysis % calculated C: 58.28, H: 3.67, Cl: 10.75, N: 12.74; % found C: 58.6, H: 3.4, Cl: 10.4, N: 13.1).

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