Hydrochloric Acid → 2-Furancarboxylic acid, 5-methyl-

5-Methylfuran-2-carbaldehyde (2.20 g, 20.0 mmol) obtained in Step 1 was dissolved in a mixed solvent of 2-methyl-2-propanol (150 mL) and water (40 mL), and 2-methyl-2-butene (10.6 mL, 100 mmol) and sodium dihydrogenphosphate (2.40 g, 20.0 mmol) were added thereto, followed by stirring at room temperature for 15 minutes. 79% sodium chlorite (8.01 g, 70.0 mmol) was added to the reaction mixture little by little, followed by stirring at room temperature for 1 hour. 4 mol/L hydrochloric acid was added to the reaction mixture to adjust the pH to 3, followed by extraction with chloroform. The organic layer was dried over anhydrous magnesium sulfate, and then the solvent was distilled away under reduced pressure. The resulting residue was purified through silica gel column chromatography (chloroform:methanol=17:3) to afford 5-methylfuran-2-carboxylic acid (606 mg, 24%).

1. additionwere added
2. stirringby stirring at room temperature for 1 hour
3. extractionfollowed by extraction with chloroform
4. dry with materialThe organic layer was dried over anhydrous magnesium sulfate
5. distillationthe solvent was distilled away under reduced pressure
6. customThe resulting residue was purified through silica gel column chromatography (chloroform:methanol=17:3)

ORD record

ord-60e246de2673413a8f930f5e436d7896

Source dataset

uspto-grants-2014_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08889718B2