Dimethylformamide → 4-(3',4'-Dimethoxy-biphenyl-4-yloxymethyl)-5-methyl-furan-2-carboxylic acid

A stirred mixture of 4-(4-iodo-phenoxymethyl)-5-methyl-furan-2-carboxylic acid methyl ester (20) (0.025 g, 0.067 mmoles), (3,4-dimethoxyphenyl)-boronic acid (0.017 g, 0.093 mmoles), N,N-dimethylformamide (3 mL), potassium acetate (0.026 g) and [1,1′-bis(diphenylphosphino) ferrocene]dichloropalladium(II), complex with dichloromethane (1:1) (4 mg) was stirred at room temperature under an argon atmosphere for 24 h. The reaction mixture was diluted with water and extracted with ethyl acetate. The extracts were washed with water, dried and concentrated in vacuo. The residue was dissolved in a mixture of tetrahydrofuran/methanol (2:1 by volume) (2.5 mL) and 1.0 M aqueous lithium hydroxide solution (0.5 mL), and stirred for 16 hours. The reaction mixture was acidified to pH=6 using 1M hydrochloric acid and extracted with ethyl acetate (3×25 mL). The extracts were dried, concentrated in vacuo and the residue purified by HPLC (gradient: 30% acetonitrile/70% water containing 0.1% trifluoroacetic acid to 70% acetonitrile/30% water at a rate of 1%/min) to give compound 96 as a solid (15 mg). LC/MS System B; Rt=1.65 mins, m/z (ES−)=367 (M−H for C21H20O6).

1. extractionextracted with ethyl acetate
2. washThe extracts were washed with water
3. customdried
4. concentrationconcentrated in vacuo
5. dissolutionThe residue was dissolved in a mixture of tetrahydrofuran/methanol (2:1 by volume) (2.5 mL) and 1.0 M aqueous lithium hydroxide solution (0.5 mL)
6. stirringstirred for 16 hours
7. extractionextracted with ethyl acetate (3×25 mL)
8. customThe extracts were dried
9. concentrationconcentrated in vacuo
10. customthe residue purified by HPLC (gradient

ORD-Eintrag

ord-a9060a441cc5449b9778fb1c0f1cf445

Quelldatensatz

uspto-grants-2009_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07528157B2