Dimethylformamide → 8-[3-(3-fluoro-phenyl)ureido]-5H,10H-imidazo[1,2-a]indeno[1,2-e]-pyrazine-4-one

Participants

Reaction Steps

The preparation is carried out as in Example 36 but from 1.5 g of 8-amino-5H,10H-imidazo[1,2-a]indeno[1,2-e]pyrazine-4-one hydrochloride, 30 ml of dimethylformamide, 0.97 g of triethylamine and 2.64 g of 3-fluorophenyl isocyanate. There is obtained 0.44 g of 8-[3-(3-fluoro-phenyl)ureido]-5H,10H-imidazo[1,2-a]indeno[1,2-e]-pyrazine-4-one in the form of a light brown solid melting above 260° C. (Analysis, % calculated C: 64.00, H: 3.76, F: 5.06, N: 18.66, O: 8.52, % found C: 64.1, H: 3.4, N: 18.6).

Provenance & Evidence