反应详情

A 500 mL Parr hydrogenation vessel was charged with 12.36 g (55.9 mmol) of (E)-3-(4-nitrophenyl)-2-propenoic acid, ethyl ester, 100 mL of absolute ethanol, 15 mL of concentrated hydrochloric acid and 0.75 g of 10% palladium-on-activated charcoal. The slurry was purged with nitrogen and then agitated under an initial pressure of 44.5 psi of hydrogen gas. After 16 h, 18.5 psi had been consumed. The flask was evacuated, purged again with nitrogen and the contents filtered through Celite and evaporated. The residue was dissolved in water and adjusted to pH 9 with solid sodium carbonate. The resulting mixture was extracted thrice with dichloromethane, and the combined organic extracts dried over Na2SO4, filtered and evaporated to provide 9.31 g, 86% of title compound as a yellow oil, sufficiently pure for use in subsequent reactions.

1. customThe slurry was purged with nitrogen
2. custom18.5 psi had been consumed
3. customThe flask was evacuated
4. custompurged again with nitrogen
5. filtrationthe contents filtered through Celite
6. customevaporated
7. dissolutionThe residue was dissolved in water
8. extractionThe resulting mixture was extracted thrice with dichloromethane
9. dry with materialthe combined organic extracts dried over Na2SO4
10. filtrationfiltered
11. customevaporated