Hydrochloric Acid → 2-[(4-Fluorophenyl)methylidene]cyclohexan-1-one

Participants

Reaction Conditions

Reaction Steps

An aqueous KOH (0.25 g in 4.4 mL water) solution was added to p-fluorobenzaldehyde Compound 10a (1.04 mL, 10 mMol) and the mixture was heated to 65° C. Cyclohexanone Compound 2a (1.03 mL, 10 mMol) was added dropwise over 10 min and the reaction mixture was refluxed for 5 hrs, then cooled to r.t. and stirred at r.t. overnight. The reaction mixture was acidified with 1N HCl (26 mL) and diluted with EtOAc. The organic layer was separated and washed with brine, then dried with anhydrous sodium sulfate and filtered. The solvent was evaporated to provide a crude product which was then purified by silica gel column (eluted with 6% EtOAc in hexane) to give 2-(4-fluoro-benzylidene)-cyclohexanone Compound 10b (1.1 g, 54%).

Provenance & Evidence