反应详情

In 5 ml of tetrahydrofuran was dissolved 0.8 g of 5-methyl-1,4-benzodioxan-6-carbaldehyde, then 27 ml of a 1% sodium hydroxide aqueous solution was added dropwise to the solution and further 0.5 g of a 10% palladium-carbon was added thereto, and the mixture was refluxed under heating for 1.5 days. The mixture was cooled to room temperature, 10 ml of a 10% sodium sulfite aqueous solution was added thereto and after stirring for 30 minutes, the mixture was filtered and the tetrahyctrofuran was removed under reduced pressure. The residue was adjusted to pH 3 with a 5% hydrochloric acid and extracted with diethyl ether. The diethyl ether layer was washed successively with water and saturated saline solution and dried over anhydrous magnesium sulfate. The solvent was removed under reduced pressure to obtain 0.53 g of the titled 5-methyl-1,4-benzodioxan-6-carboxylic acid (yield: 61%).

1. additionwas added
2. temperaturethe mixture was refluxed
3. temperatureunder heating for 1.5 days
4. filtrationthe mixture was filtered
5. customthe tetrahyctrofuran was removed under reduced pressure
6. extractionextracted with diethyl ether
7. washThe diethyl ether layer was washed successively with water and saturated saline solution
8. dry with materialdried over anhydrous magnesium sulfate
9. customThe solvent was removed under reduced pressure