反应详情

Aluminum chloride (298 mg) was added portionwise to a solution of 2-phenylpyrazolo[1,5-a]pyridine (145 mg) and ethyl 3-dimethylaminoacrylate (316 mg) in methylene chloride (2 ml) at 5° to 6° C. After being stirred at room temperature overnight, the reaction mixture was poured onto water (50 ml), neutralized with saturated aqueous sodium bicarbonate solution, and extracted with chloroform (50 ml×2). The extracts were washed with saturated sodium chloride aqueous solution (20 ml), dried over magnesium sulfate, and evaporated in vacuo. The residue was chromatographed on silica gel with a mixture of chloroform and n-hexane (1:1) as an eluent. The fractions containing the objective compound were combined and evaporated in vacuo to give ethyl 3-(2-phenylpyrazolo[1,5-a]pyridin-3-yl)acrylate (trans isomer) (189.4 mg).

1. additionthe reaction mixture was poured onto water (50 ml)
2. extractionextracted with chloroform (50 ml×2)
3. washThe extracts were washed with saturated sodium chloride aqueous solution (20 ml)
4. dry with materialdried over magnesium sulfate
5. customevaporated in vacuo
6. customThe residue was chromatographed on silica gel with a mixture of chloroform and n-hexane (1:1) as an eluent
7. additionThe fractions containing the objective compound
8. customevaporated in vacuo