Dopac → 5-(2-Hydroxyethyl)-2-methyl-1,3-benzodioxole

A suspension of 1.0 g of 3,4-dihydroxyphenylacetic acid, 1.4 g of vinyl acetate, 6 mg of mercury oxide (yellow) and 0.03 ml of boron fluoride/ethyl etherate in 9 ml of toluene was stirred at room temperature for 14 h. The reaction mixture was diluted with ethyl acetate and washed with water and an aqueous common salt solution The organic layer was dried over magnesium sulfate and the solvent was distilled off. An oil thus obtained was dissolved in 10 ml of tetrahydrofuran and the solution was added dropwise to a suspension of 0.5 g of lithium aluminum hydride in tetrahydrofuran under cooling with ice. The mixture was stirred at room temperature for 1 h. 0.5 ml of water, then 0.5 ml of a 15% aqueous sodium hydroxide solution and finally 1.5 ml of water were added thereto and an insoluble matter was filtered off. The filtrate was concentrated and treated according to silica gel column chromatography (ethyl acetate/hexane=1:1) to obtain 0.8 g of the intended compound in the form of a colorless oil.

1. washwashed with water
2. dry with materialan aqueous common salt solution The organic layer was dried over magnesium sulfate
3. distillationthe solvent was distilled off
4. customAn oil thus obtained
5. temperatureunder cooling with ice
6. stirringThe mixture was stirred at room temperature for 1 h
7. filtrationan insoluble matter was filtered off
8. concentrationThe filtrate was concentrated
9. additiontreated

ORD-Eintrag

ord-169e2650a0ae4fc28cefd254ac2f40c1

Quelldatensatz

uspto-grants-1992_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05110956