Ethyl pyruvate → HCID 19875858, compound

Participants

Reaction Steps

A mixture of 9.1 parts of 4-[(3-chlorophenyl)(1H-imidazol-1-yl)methyl]-1,2-benzenediamine, 3.7 parts of ethyl 2-oxopropanoate and 160 parts of methanol was stirred for 30 minutes at reflux temperature. The reaction mixture was evaporated to dry. The residue was crystallized from a mixture of 36 parts of 2-propanone and 4 parts of methanol. After stirring for 30 minutes at room temperature, the precipitated product was filtered off (the filtrate was set aside) and recrystallized from a mixture of methanol and dichloromethane. The product was filtered off and dried, yielding 3 parts (28.1%) of 6-[(3-chlorophenyl)(1H-imidazol-1-yl)methyl]-3-methyl-2(1H)-quinoxalinone; mp. 270.9° C. (comp. 73). The filtrate (see above) was evaporated and the residue was purified by column chromatography over silica gel using a mixture of dichloromethane and methanol (95:5 by volume) as eluent. The pure fractions were collected and the eluent was evaporated. The residue was taken up in a mixture of 2-butanone and 2-propanone and the whole was allowed to stand for a few days. the precipitated product was filtered off and dried, yielding 1.4 parts (11.5%) of 7-[(3-chlorophenyl) (1H-imidazol-1-yl)methyl]-3-methyl-2(1H)-quinoxalinone hemihydrate; mp. 201.9° C. (comp. 81).

Provenance & Evidence