Nitric Acid → HCID 178494287, compound

To a suspension of barbituric acid (51.2 g) in methanol (1 L) was added concentrated sulfuric acid (80 mL) in a dropwise manner over 20 minutes, and the mixture was stirred at room temperature for 22 hours. The crystals were collected by filtration. The collected crystals were washed with methanol, cold water and diethyl ether successively, and dried under reduced pressure to give 2,4-dihydroxy-6-methoxypyrimidine (52.9 g). To a mixture of fuming nitric acid (20 mL) and concentrated sulfuric acid (10 mL) was added 2,4-dihydroxy-6-methoxypyrimidine (14.2 g) slowly at around 15° C., and the mixture was stirred at room temperature for 1 hour. To the reaction mixture was added ice water (150 mL), and the mixture was stirred at room temperature for 30 minutes. The crystals were collected by filtration. The collected crystals were washed with water, and dried under reduced pressure to give the title compound (7.4 g).

1. stirringthe mixture was stirred at room temperature for 30 minutes
2. filtrationThe crystals were collected by filtration
3. washThe collected crystals were washed with water
4. customdried under reduced pressure

ORD record

ord-f1dc768a08024afd9e94347c678df4ec

Source dataset

uspto-grants-2012_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08217069B2