反应详情

To a solution of 259 mg of α-bromomethyl-4-chlorobenzyl alcohol and 311 mg of 2-(2,4-dichlorophenoxymethyl)-3,4-dihydro-2H-pyran in 6 ml of diethyl ether was added one drop of phosphorus oxytrichloride, and the mixture was stirred at room temperature for 1 day. After 3 drops of triethylamine had been added, the solvent was evaporated off under reduced pressure and the residue was purified by column chromatography through silica gel eluted with a 5:50:11 by volume mixture of benzene, hexane and ethyl acetate, to give 147 mg of the isomer of lesser polarity of trans-6-(2,4-dichlorophenoxymethyl)-2-[2-bromo-1-(4-chlorophenyl)ethoxy]tetrahydropyran melting at 86°-87° C., 165 mg of the isomer of greater polarity melting at 97°-98° C., and 80 mg of a mixture thereof.

1. customthe solvent was evaporated off under reduced pressure
2. customthe residue was purified by column chromatography through silica gel
3. washeluted with a 5:50:11 by volume mixture of benzene, hexane and ethyl acetate