Dimethyl Sulfoxide → (10 RS)-10-acetamido-10-(4-phenylbutyl)-5H,10H-imidazo[1,2-a]indeno[1,2-e]pyrazin-4-one

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Reaction Steps

The process is performed as in Example 44 but starting with 3 g of (10 RS)-10-acetamido-5H,10H-imidazo[1,2-a]indeno[1,2-e]pyrazin-4-one, 70 ml of dimethyl sulphoxide, 1.2 g of an 80% suspension of sodium hydride in oil and 2.7 g of 1-chloro-4-phenylbutane. The reaction medium is poured into a mixture of 250 g of ice, 435 ml of distilled water and 6 ml of acetic acid. 200 ml of ethyl acetate are added to the suspension obtained and the mixture is stirred, followed, after separation of the phases once settling has taken place, by removal of the ethyl acetate. The operation is repeated once. The precipitate is filtered off on a sinter funnel. The solid is crystallized from methanol. 80 mg of (10 RS)-10-acetamido-10-(4-phenylbutyl)-5H,10H-imidazo[1,2-a]indeno[1,2-e]pyrazin-4-one are thus obtained in the form of a green solid melting above 260° C. (Analysis, % calculated C: 72.8, H: 5.9, N: 13.6, O: 7.8, % found C: 72.8, H: 6.0, N: 14.1, O: 7.9).

Provenance & Evidence