Hydrochloric Acid → Anthranilamide hydrochloride

Anthranilamide hydrochloride was prepared by adding 20 ml of concentrated hydrochloric acid (37% by weight) to a solution of 27.3 g of anthranilamide in 200 ml of methanol. This mixture was cooled in an ice bath to precipitate the hydrochloride which was then collected and dried to obtain a product melting at 234°C with decomposition. A 17.4 g (0.1 mole) portion of the hydrochloride obtained above was refluxed for 3 hours with 100 ml acetic anhydride and allows to stand overnight. The mixture was then cooled in an ice bath and the solids collected by filtration on a Buchner funnel. The filter cake was slurried in 100 ml of water, and warmed to aid solution and then 28% aqueous ammonia was added until the mixture was alkaline. After cooling the 2-methyl-4-(3H)quinazolinone precipitated as a solid, was then collected, washed with a small amount of cold water and dried at 70°C to obtain 6.72 g of the desired product. The 2-methyl-4-(3 H)quinazolinone melted at 236°-8°C and was obtained in a 42% yield.

1. temperatureThis mixture was cooled in an ice bath
2. customto precipitate the hydrochloride which
3. customwas then collected
4. customdried

ORD record

ord-59ecafef273240dd9eb067708e82ebc8

Source dataset

uspto-grants-1976_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US03974277