Acetone → 1,2,6-trimethyl-3-ethyl-1,2,3,6,7,8,9,9a-octahydro-4-oxo-4H-pyrido(1,2-a)pyrimidine hydrochloride

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Reaction Steps

0.01 moles of 2,6-dimethyl-3-ethyl-4-oxo-4H-pyrido(1,2-a)pyrimidine are dissolved in 20 ml. of acetone, 0.03 moles of methyl iodide are added and the mixture is kept in a bomb tube at 150° C. for 24 hours. The solution is evaporated to dryness, the residue is dissolved in 15 ml. of methanol and a solution of 0.05 moles of sodium tetrahydroborate(III) in 10 ml. of water is added. After 4 hours the methanol is distilled off and the aqueous phase is extracted with three 20-ml. portions of chloroform. The organic phase is dried, evaporated and added to the oily substance obtained are 10 ml. of ethanol saturated with hydrochloric acid. 1,2,6-trimethyl-3-ethyl-1,2,3,6,7,8,9,9a-octahydro-4-oxo-4H-pyrido(1,2-a)pyrimidine hydrochloride is obtained, while crystallizes when triturated with ether. The product obtained after recrystallization from a mixture of acetone and ether sublimates over 206° C. Yield: 41%.

Provenance & Evidence