Triethylamine → 1,3-dimethyl-6-[4-(3-[3-nitrophenoxy]propyl)piperazin-1-yl]-2,4(1H,3H)-pyrimidinedione

Participants

Reaction Steps

1.69 g of the above oily compound d, 1.12 g of 1,3-dimethyl-6-(1-piperazinyl)-2,4(1H,3H)-pyrimidinedione (compound b) and 1 ml of triethylamine were heated under reflux in 20 ml of dioxane for 4 hours to carry out reaction. After completion of the reaction, insolubles were removed from the reaction mixture by filtration, and the filtrate was then concentrated. Next, the resultant residue (concentrate) was dissolved in chloroform, and the resultant chloroform solution was washed with water. Afterward, the washed organic layer was dried over anhydrous magnesium sulfate and then treated with under reduced pressure to distill off the solvent. The residue was further purified through a silica gel column chromatography (chloroform/methanol=100/1 to 25/1 in volume ratio) and then recrystallized from ethanol. The resultant crystals were collected by filtration, washed, and then dried, thereby obtaining 1.35 g of 1,3-dimethyl-6-[4-(3-[3-nitrophenoxy]propyl)piperazin-1-yl]-2,4(1H,3H)-pyrimidinedione (Compound c).

Provenance & Evidence