反应详情

To a solution of 104.6 parts of methyl 2-hydroxy-4-(acetylamino)benzoate in 470 parts of N,N-dimethylformamide were added portionwise 24 parts of a dispersion of sodium hydride in mineral oil (50%) under a nitrogen atmosphere. After stirring for 1 hour at room temperature, there was added a solution of 55.2 parts of 3-chloro-2-methyl -1-propene in 47 parts of N,N-dimethylformamide. Stirring was continued for 3 days at 50° C. The reaction mixture was evaporated and the residue was dissolved in dichloromethane. This solution was washed with water, sodium hydroxide 10% and water and was then dried, filtered and evaporated. The residue was crystallized from 2,2'-oxybispropane. The product was filtered off and dried, yielding 65.8 parts (50.0%) of methyl 4-(acetylamino)-2-[(2-methyl-2-propenyl)oxy]benzoate (interm. 15).

1. stirringStirring
2. waitwas continued for 3 days at 50° C
3. customThe reaction mixture was evaporated
4. dissolutionthe residue was dissolved in dichloromethane
5. washThis solution was washed with water, sodium hydroxide 10% and water
6. customwas then dried
7. filtrationfiltered
8. customevaporated
9. customThe residue was crystallized from 2,2'-oxybispropane
10. filtrationThe product was filtered off
11. customdried