反应详情

0.4 g of bis(triphenylphosphine)palladium dichloride and 5 g of ammonium formate were added to a solution of 1.1 g of allyl 1-(4-allyloxy-3-methoxycinnamoyl)-4-methylpiperidine-4-carboxylate (Example 67) in 100 ml of THF. Under an argon stream, the solution was reacted for hours, while it was refluxed. After reaction, 150 ml of an aqueous sodium chloride solution was added to the reaction solution. The solution was extracted three times with 50 ml of ethyl acetate. The organic layer obtained was washed three times with an aqueous sodium chloride solution and dried over magnesium sulfate. Thereafter, the solvent was removed in vacuo, yielding 1.1 g of 1-(4-hydroxy-3-methoxycinnamoyl)-4-methylpiperidine-4-carboxylic acid (a compound of the present invention) as a pale yellow oil, which had the following physiochemical properties:

1. customUnder an argon stream, the solution was reacted for hours, while it
2. temperaturewas refluxed
3. additionwas added to the reaction solution
4. extractionThe solution was extracted three times with 50 ml of ethyl acetate
5. customThe organic layer obtained
6. washwas washed three times with an aqueous sodium chloride solution
7. dry with materialdried over magnesium sulfate
8. customThereafter, the solvent was removed in vacuo