Reaktion #165242

Reaktionsgleichung

tetrahydrofuran

5-(4-fluoro-phenoxy)-thiophene-2-carbonitrile

diisobutyl aluminum hydride

→

title compound

Ausbeute 55.0%

5-(4-Fluoro-phenoxy)-thiophene-2-carbaldehyde

Ausbeute 55.0%

Lösungsmittel

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   Extraktionfollowed by extraction with ethyl acetate
2. 2
   WaschenThe organic layer was washed with saturated aqueous sodium chloride
3. 3
   Sonstigethe solvent was evaporated under a reduced pressure
4. 4
   SonstigeThe residue was purified by silica gel column chromatography (ethyl acetate:heptane=1:5)

Vorschrift

To a tetrahydrofuran (150 mL) solution of 5-(4-fluoro-phenoxy)-thiophene-2-carbonitrile (6.10 g, 27.8 mmol) described in Manufacturing Example 91-1-1 was added dropwise diisobutyl aluminum hydride (0.97 M n-hexane solution, 43.0 mL, 41.7 mmol) on a dry ice-ethanol bath (−78° C.) under nitrogen atmosphere, which was stirred for 2 hours at room temperature. The reaction solution was added to water, followed by extraction with ethyl acetate. The organic layer was washed with saturated aqueous sodium chloride, and the solvent was evaporated under a reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate:heptane=1:5) to obtain the title compound (3.4 g, 55.0%).

Quelle