Hydrochloric Acid → alpha-Ethoxyimino-2-phenoxymethylbenzyl chloride

Participants

Reaction Conditions

Reaction Steps

Dichloroethane (50 ml), thionyl chloride (6.54 g, 0.055 mol) and dimethylformamide (0.25 ml) were added to 2-phenoxymethylbenzoic acid (11.41 g, 0.05 mol), and the mixture was stirred at 80° C. for 2 hours. After completion of the reaction, the mixture was concentrated under reduced pressure, and the residue was dissolved in dichloromethane (25 ml). The solution was added to a mixture of ethoxyamine hydrochloride (5.85 g, 0.06 mol), pyridine (9.89 g, 0.125 mol) and dry dichloromethane (50 ml) under ice-cooling over 20 minutes, and then the resulting mixture was stirred at room temperature for 2 hours. After completion of the reaction, water (200 ml) was added, adjusted to pH<2 with conc. hydrochloric acid, and extracted with dichloromethane. The dichloromethane layer was dried over anhydrous magnesium sulfate and concentrated under reduced pressure. Acetonitrile (150 ml), triphenylphosphine (20.98 g, 0.08 mol) and carbon tetrachloride (24.61 g, 0.16 mol) were added to the residue, and the mixture was stirred under reflux for 1.5 hours. After completion of the reaction, the mixture was concentrated under reduced pressure, and the residue was purified by silica gel chromatography (ethyl acetate/n-hexane) to give α-ethoxyimino-2-phenoxymethylbenzyl chloride (13.51 g, 93.2%) as a colorless oil.

Provenance & Evidence