HCID 13363392, compound → HCID 13363393, compound

Participants

Reaction Steps

A mixture of 40 parts of 3-(2-chloroethyl)-2-methyl-7-nitro-4H-pyrido[1,2-a]pyrimidin-4-one and 240 parts of methanol was hydrogenated at normal pressure and at room temperature with 0.5 parts of platinum oxide. After the calculated amount of hydrogen was taken up, the catalyst was filtered off and the filtrate was evaporated. The residue was purified by column-chromatography over silica gel using a mixture of trichloromethane and methanol (95:5 by volume) as eluent. The pure fractions were collected and the eluent was evaporated. The residue was converted into the hydrochloride salt in acetonitrile and 2-propanol. The salt was filtered off and dissolved in water while heating. The solution was treated with activated charcoal. The latter was filtered off over Hyflo and the filter-cake was washed with water. The filtrate was stirred in a dilute ammonium hydroxide solution. The precipitated product was filtered off, washed with water and with petroleumether, and dried, yielding 19.4 parts of 7-amino-3-(2-chloroethyl)-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one; mp. 185° C. (intermediate 9).

Provenance & Evidence