反应详情

Triethylamine (1.54 mL, 11 mmol) and then 4-cyanophenylhydrazine hydrochloride (1.71 g, 10 mmol) were added to a solution of trifluoroacetoamidine (1.57 g, 14 mmol) in methanol (10 mL). The mixture was stirred overnight. The solvent was removed under reduced pressure. 20 mL of water and 50 mL of ethyl acetate-tetrahydrofuran (9:1) were added to the residue and the organic layer was separated and the aqueous layer was extracted with 50 mL of ethyl acetate-tetrahydrofuran (9:1). A combined organic layer was washed with water and brine, and dried over magnesium sulfate. The solvent was removed under reduced pressure. The residue was isolated by filtartion, washed with diisopropyl ether-hexane, and dried in vacuo to give 2,2,2-trifluoro-N′-(4-cyanophenyl)ethanehydrazonamide (2.07 g, 90.5% yield).

1. customThe solvent was removed under reduced pressure
2. addition20 mL of water and 50 mL of ethyl acetate-tetrahydrofuran (9:1) were added to the residue
3. customthe organic layer was separated
4. extractionthe aqueous layer was extracted with 50 mL of ethyl acetate-tetrahydrofuran (9:1)
5. washA combined organic layer was washed with water and brine
6. dry with materialdried over magnesium sulfate
7. customThe solvent was removed under reduced pressure
8. customThe residue was isolated by filtartion
9. washwashed with diisopropyl ether-hexane
10. customdried in vacuo