反应详情

温度

80 °C

N-Bromosuccinamide was added to a mixture of (E)-N-(2-chloro-6-methylphenyl)-3-ethoxyacrylamide in 1,4-dioxane and water at −10° C. to 0° C. to obtain a slurry which was warmed and stirred at 20° C. to 22° C. for 3 hours. Thiourea was added and the mixture was heated to 80° C. After 2 hours, the resulting solution was cooled to 20° C. to 22° C. and concentrated ammonium hydroxide was added dropwise. The resulting slurry was concentrated under vacuum to about half volume and cooled to 0° C. to 5° C. to obtain a solid which was collected by vacuum filtration, washed with cold water, and dried to obtain 2-amino-N-(2-chloro-6-methylphenyl)thiazole-5-carboxamide (Formula 1c).

1. customto obtain a slurry which
2. temperaturewas warmed
3. waitAfter 2 hours
4. temperaturethe resulting solution was cooled to 20° C. to 22° C.
5. concentrationThe resulting slurry was concentrated under vacuum to about half volume
6. temperaturecooled to 0° C. to 5° C.
7. customto obtain a solid which
8. filtrationwas collected by vacuum filtration
9. washwashed with cold water
10. customdried