Bromoform → 2-(4-Isopropoxyphenyl)-2-methoxyacetic acid

An oven-dried flask was charged with 4-isopropoxybenzaldehyde (4.9 g, 29.9 mmol), anhydrous methanol (30 mL) and anhydrous dioxane (30 mL) then fitted with an addition funnel. The addition funnel was charged with a solution of KOH (8.4 g, 149.5 mmol) in anhydrous methanol (30 mL) and an aliquot (˜2 mL) was added to the reaction mixture. Bromoform (3.4 mL, 38.8 mmol) was added to the reaction mixture then the remaining KOH/MeOH solution was added dropwise over 10 minutes. After stirring for 18 hours, the mixture was concentrated in vacuo. The residue was diluted with water and the pH was adjusted to ˜2 using concentrated HCl then extracted with EtOAc. The combined organics were dried over Na2SO4 and filtered. Concentration of the filtrate in vacuo gave 2-(4-isopropoxyphenyl)-2-methoxyacetic acid as a light yellow solid (6.8 g) which was used without further purification.

1. customthen fitted with an addition funnel
2. additionan aliquot (˜2 mL) was added to the reaction mixture
3. concentrationthe mixture was concentrated in vacuo
4. additionThe residue was diluted with water
5. extractionthen extracted with EtOAc
6. dry with materialThe combined organics were dried over Na2SO4
7. filtrationfiltered

ORD-Eintrag

ord-e9c5eccb47884e1e8730c24ca8b655c2

Quelldatensatz

uspto-grants-2016_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09434707B2