Tetrahydrofuran → 5-Cyclopropyl-6-(4-fluorophenyl)-2-isopropoxynicotinaldehyde

Participants

Reaction Steps

A THF (20 mL) solution of methyl 5-cyclopropyl-6-(4-fluorophenyl)-2-isopropoxynicotinate (3.17 g) was added to a THF (20 mL) suspension of lithium aluminum hydride (365 mg) under ice cooling in a nitrogen atmosphere. After stirring at the same temperature as above for 30 minutes, water (0.35 mL) and a 15% aqueous sodium hydroxide solution (0.35 mL) were added thereto, and the mixture was stirred for 5 minutes. Then, water (1.05 mL) was further added thereto. The reaction mixture was stirred for 30 minutes and then filtered. The filtrate was concentrated under reduced pressure. Manganese dioxide (8.36 g) was added to a toluene (30 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 (2.45 g)

Provenance & Evidence