反应详情

A solution of 3-hydroxy-4-methoxybenzaldehyde (14.20 g) in dry dimethylformamide (300 mL) is treated portionwise with sodium hydride (60% dispersion in oil; 3.70 g) at room temperature under nitrogen. 3-Chlorocyclo-pentene (9.6 mL) is added and the resulting mixture is stirred overnight. The solvent is then removed under reduced pressure and the residue is partitioned between water (500 mL) and dichloromethane (500 mL) and the aqueous layer is further extracted with dichloromethane (500 mL). The combined organic extracts are dried and evaporated under reduced pressure and the residue is subjected to flash chromatography on silica gel, eluting with a mixture of ethyl acetate and pentane (1:1 v/v), to give 3-cyclopent-2-enyloxy-4-methoxybenzaldehyde, in the form of a pale brown oil (11.2 g).

1. customThe solvent is then removed under reduced pressure
2. customthe residue is partitioned between water (500 mL) and dichloromethane (500 mL)
3. extractionthe aqueous layer is further extracted with dichloromethane (500 mL)
4. customThe combined organic extracts are dried
5. customevaporated under reduced pressure
6. washeluting with a mixture of ethyl acetate and pentane (1:1 v/v)