反应详情

The crude 4-(3-benzyl-2-cyano-5-methyl-benzofuran-7-yl)-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester from step 1 was dissolved in ethanol, and 10% palladium on carbon was added. The mixture was shaken under hydrogen (2.76 Bar) for 40 hours. After filtering off the catalyst, the mixture was concentrated under reduced pressure and purified using preparative thin layer chromatography (1/9 ethyl acetate/hexanes) to give 4-(3-benzyl-2-cyano-5-methyl-benzofuran-7-yl)-piperidine-1-carboxylic acid tert-butyl ester.

1. filtrationAfter filtering off the catalyst
2. concentrationthe mixture was concentrated under reduced pressure
3. custompurified