Acetic Anhydride → N-[(4,5-dihydro-4-oxo-10H-imidazo[1,2-a]indeno[1,2-e]pyrazin-9-yl)methyl]acetamide

Participants

Reaction Conditions

Reaction Steps

A mixture of 1 g of 9-aminomethyl-5H,10H-imidazo[1,2-a]indeno[1,2-e]pyrazin-4-one and 20 ml of acetic anhydride is stirred under an argon atmosphere for 2 hours at a temperature in the region of 20° C. The reaction mixture is filtered and the insoluble material is washed successively with 10 ml of acetic anhydride and two times 40 ml of methyl-tert-butyl ether and then dried under reduced pressure (15 mm Hg; 2 kPa) at 20° C. The white solid is suspended in a mixture of acetone (30 ml) and methanol (5 ml), then filtered and dried under reduced pressure (1 mm Hg; 0.13 kPa) at 60° C. 1.03 g of N-[(4,5-dihydro-4-oxo-10H-imidazo[1,2-a]indeno[1,2-e]pyrazin-9-yl)methyl]acetamide are obtained in the form of a white solid, the melting point of which is greater than 260° C. (Analysis C16H14N4O2; % Calculated C: 65.30, H: 4.79, N: 19.04; % Found C: 65.20, H: 5.10, N: 19.30).

Provenance & Evidence