反应详情

A mixture of ethyl 2-triphenylphosphoranylideneacetate (34.84 g, 100 mmol, 1 eq) and furan-2-carbaldehyde (9609 mg, 100 mmol, 1 eq) in anhydrous THF (200 ml) was stirred at room temperature for 24 h. The solvent was evaporated under reduced pressure and the residue triturated with ether to produce a brown solution and a precipitate. The solid was filtered, washed and removed. The filtrate was then evaporated. The product was purified by column chromatography on silica eluting with 0-20% ethyl acetate in hexanes. The desired fractions were evaporated to yield a cis/trans mixture of ethyl (E)-3-(2-furyl)prop-2-enoate as a pale yellow oil (NMR suggested mainly trans product) (15.5 g, 93%). b) A cis/trans mixture of ethyl (E)-3-(2-furyl)prop-2-enoate (15.5 g, 93.27 mmol, 1 eq) was stirred in ethanol (120 ml) containing 10% palladium on charcoal (775 mg, 5% by w). The reaction mixture was stirred under hydrogen for 4 h. A further quantity of 10% Pd/C (775 mg, 5% by w) was added. The reaction was stirred under hydrogen for an additional 95 mins. The reaction was filtered and evaporated under reduced pressure. The crude product was purified by silica column chromatography eluting with 20% ethyl acetate in hexanes. The desired fractions were evaporated under reduced pressure and ethyl 3-(2-furyl)propanoate was obtained as a clear oil (3.69 g, 24% yield).

1. customThe solvent was evaporated under reduced pressure
2. customthe residue triturated with ether
3. customto produce a brown solution
4. filtrationThe solid was filtered
5. washwashed
6. customremoved
7. customThe filtrate was then evaporated
8. customThe product was purified by column chromatography on silica eluting with 0-20% ethyl acetate in hexanes
9. customThe desired fractions were evaporated
10. customto yield
11. stirringThe reaction mixture was stirred under hydrogen for 4 h
12. stirringThe reaction was stirred under hydrogen for an additional 95 mins
13. filtrationThe reaction was filtered
14. customevaporated under reduced pressure
15. customThe crude product was purified by silica column chromatography
16. washeluting with 20% ethyl acetate in hexanes
17. customThe desired fractions were evaporated under reduced pressure