Tetrahydrofuran → 2-Cyclopropyl-6-ethoxy-4'-fluorobiphenyl-4-carbaldehyde

A THF (50 mL) solution of ethyl 2-cyclopropyl-6-ethoxy-4′-fluorobiphenyl-4-carboxylate (10.5 g) was added to a THF (50 mL) suspension of lithium aluminum hydride (1.21 g) under ice cooling in a nitrogen atmosphere. After stirring at the same temperature as above for 30 minutes, water (1.2 mL) and a 15% aqueous sodium hydroxide solution (1.2 mL) were added thereto, and the mixture was stirred for 5 minutes. Water (3.6 mL) was further added to the reaction mixture, and the mixture was stirred for 30 minutes and then filtered. The filtrate was concentrated under reduced pressure. Manganese dioxide (13.9 g) was added to a toluene (60 mL) solution of the obtained residue, and the mixture was stirred at 60° C. for 1 hour in a nitrogen atmosphere. The reaction mixture was filtered, and then, the solvent was distilled off under reduced pressure. The obtained residue was purified by silica gel column chromatography (hexane/ethyl acetate) to obtain the title compound (7.79 g).

1. stirringthe mixture was stirred for 30 minutes
2. filtrationfiltered
3. concentrationThe filtrate was concentrated under reduced pressure
4. additionManganese dioxide (13.9 g) was added to a toluene (60 mL) solution of the obtained residue
5. stirringthe mixture was stirred at 60° C. for 1 hour in a nitrogen atmosphere
6. filtrationThe reaction mixture was filtered
7. distillationthe solvent was distilled off under reduced pressure
8. customThe obtained residue was purified by silica gel column chromatography (hexane/ethyl acetate)

ORD record

ord-4b8fad8525bf411f8689b17654ad2fad

Source dataset

uspto-grants-2016_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09353108B2