Reaktion #337894

Reaktionsgleichung

3-(4-Chloro-2-fluoro-benzyloxy)-2-hydroxy-benzaldehyde

2-fluoro-ethanol

triphenylphosphine

diisopropyl azodicarboxylate

→

compound

Ausbeute 54.0%

3-(4-Chloro-2-fluoro-benzyloxy)-2-(2-fluoro-ethoxy)-benzaldehyde

Ausbeute 54.0%

Lösungsmittel

water

ethyl acetate

tetrahydrofuran

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.WAITat 40° C. for 3 days
2. 2
   SonstigeThe organic layers were collected
3. 3
   Waschenwashed with brine
4. 4
   Trocknendried over magnesium sulfate
5. 5
   SonstigeAfter removal of solvent
6. 6
   Sonstigethe residue was purified by silica gel column chromatography
7. 7
   Wascheneluting with ethyl acetate in hexanes

Vorschrift

To a solution of 3-(4-Chloro-2-fluoro-benzyloxy)-2-hydroxy-benzaldehyde (659, 140 mg, 0.5 mmol, prepared by protocol of Example 43, Steps 1 and 2 of Scheme 71, using 4-chloro-2-fluoro-benzyl bromide in place of 4-chloro-benzyl bromide in Step 1) in tetrahydrofuran (8 mL) was added dropwise a mixture of 2-fluoro-ethanol (64 mg, 1.0 mmol), triphenylphosphine (180 mg, 0.7 mmol), and diisopropyl azodicarboxylate (120 mg, 0.6 mol) in tetrahydrofuran (5 ml) at 0° C. The reaction mixture was stirred at 0° C. for 10 minutes and then at 40° C. for 3 days. The reaction mixture was dissolved in water and ethyl acetate. The organic layers were collected, washed with brine, and dried over magnesium sulfate. After removal of solvent, the residue was purified by silica gel column chromatography eluting with ethyl acetate in hexanes to provide the compound as a white solid (660, 88 mg, 54%). MS (ESI) [M+H+]+=327.12.

Quelle