Hydrogen Bromide → HCID 23048852, compound

Participants

Reaction Steps

To a stirred mixture of 300 parts of a hydrobromic acid solution 48% in water, 100 parts of a hydrobromic acid solution in acetic acid and 2 parts of sodium hydrogen sulfite were added 18.9 parts of 4-butyl-2-[4-[4-(4-methoxyphenyl)-1-piperazinyl]phenyl]-1,2,4-triazine-3,5(2H,4H)-dione. Stirring was continued for 5 hours at reflux temperature. After cooling, the precipitated product was filtered off and dissolved in a mixture of water and methanol. The mixture was neutralized with a saturated sodium hydrogen carbonate solution. The precipitated product was filtered off and crystallized twice; first from 4-methyl-2-pentanone and then from 1-propanol. The product was filtered off and dried in vacuo at 75° C., yielding 9.1 parts (50.2%) of 4-butyl-2-[4-[4-(4-hydroxyphenyl)-1-piperazinyl]phenyl]-1,2,4-triazine-3,5(2H,4H)-dione; mp. 202.3° C. (compound 10.05).

Provenance & Evidence