Water → 7-Chloro-2,3-dihydro-1,4-benzodioxine-5-carboxylic acid

Temperature

5 °C

7-Chloro-2,3-dihydro-1,4-benzodioxine-5-carbaldehyde (6.25 g, 31.4 mmol) was dissolved in acetone (150 mL) and the solution was then cooled to 5° C. A solution of CrO3 in sulfuric acid (4 M in 4 M H2SO4, 12.5 mL, 50 mmol) was added dropwise over 2 min and the mixture was refluxed for 30 min. Water (150 mL) was added and then most of the acetone was removed by evaporation. The mixture was extracted with ether (150 mL) and the organic solution was then extracted with a solution of NaOH (0.5 M, 150 mL). The aqueous solution was acidified with 2 M hydrochloric acid and then extracted with ether (150 mL). The organic solution was washed with brine and dried over Na2SO4. The solvent was removed by evaporation and the residue treated with CH2Cl2. After filtration and drying there was obtained 5.2 g (77%) of 7-chloro-2,3-dihydro-1,4-benzodioxine-5-carboxylic acid. 1H NMR (400 MHz, acetone-d6): 4.3-4.4 (m, 4H), 7.1 (d, 1H), 7.3 (d, 1H), 11-12 (b, 1H).

1. temperaturethe mixture was refluxed for 30 min
2. custommost of the acetone was removed by evaporation
3. extractionThe mixture was extracted with ether (150 mL)
4. extractionthe organic solution was then extracted with a solution of NaOH (0.5 M, 150 mL)
5. extractionextracted with ether (150 mL)
6. washThe organic solution was washed with brine
7. dry with materialdried over Na2SO4
8. customThe solvent was removed by evaporation
9. additionthe residue treated with CH2Cl2
10. filtrationAfter filtration
11. customdrying there

ORD record

ord-b2ee901059d64985bd1d99f1511d2af7

Source dataset

uspto-grants-2008_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07402581B2