Thionyl Chloride → 4-[7-(3,5,6-Trimethyl-1,4-benzoquinon-2-yl)-7-phenylheptoxy]benzohydroxamic acid

Participants

Reaction Conditions

Reaction Steps

To a solution of 0.92 g (2.0 mmole) of 4-[7-(3,5,6-trimethyl-1,4-benzoquinon -2-yl)-7-phenylheptoxy]benzoic acid in dichloromethane (10 ml) were added 0.44 ml (2×3 mmole) of thionyl chloride and dimethylformamide (8 μl),and the mixture was stirred at 40° C. for 1 hour. The solvent was distilled off, and the residue was dissolved in tetrahydrofuran (10 ml), followed by ice-cooling. After 0.21 g (2×1.5 mmole) of hydroxylamine hydrochloride was added, a solution of 0.34 g (2×2 mmole) of sodium hydrogencarbonate in water (5 ml) was added to the reaction mixture, followed by stirring for 15 minutes under ice-cooling. The tetrahydrofuran was distilled off under reduced pressure, and ethyl acetate was added to the residue to conduct extraction. The ethyl acetate layer was separated out, washed with aqueous sodium chloride solution, dried (magnesium sulfate) and evaporated. The residue was chromatographed on a silica gel column to elute with ethyl acetate to give 4-[7-(3,5,6-trimethyl-1,4-benzoquinon -2-yl)-7-phenylheptoxy]benzohydroxamic acid (0.86 g, 91%).

Provenance & Evidence