Cyanoacetamide → 6-[m-(4-Methyl-1-piperazinyl)phenyl]-1,2-dihydro-2-oxonicotinonitrile

Beteiligte Stoffe

Reaktionsschritte

A suspension of 5.3 g. (0.098 mole) of sodium methoxide in 100 ml. ethyl ether under nitrogen is cooled to 3° and treated dropwise with a solution of 18.4 g. (0.084 mole) of m-(4-methyl-1-piperazinyl)acetophenone and 6.25 g. (0.084 mole) of ethyl formate in 100 ml. ethyl ether while keeping the temperature below 5°. When the addition is completed, the mixture is allowed to stir at room temperature overnight. 100 ml. water is then added and the layers separated. The ethyl ether layer is washed with an additional 75 ml. water. The pH of the aqueous layer is adjusted to pH 9 with acetic acid. 10.6 g. (0.126 mole) of cyanoacetamide is then added and the solution heated at 90° for 6 hours. A solid formed which is collected and dried. Recrystallization from DMSO/water gives 14.8 g. (60.2%) of pure 6-m-(4-methyl-1-piperazinyl)-phenyl]-1,2-dihydro-2-oxonicotinonitrile, m.p. 264°-267° d., as a yellow solid.

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