2,4-Dichlorophenol → 2-(2,4-dichlorophenoxymethyl)-3,4-dihydro-2H-pyran

A solution of 359 mg of 2,4-dichlorophenol in 3 ml of dimethylformamide was stirred with 96 mg of 55% sodium hydride at room temperature for 30 minutes. A solution of 536 mg of 2-tosyloxymethyl-3,4-dihydro-2H-pyran in 2 ml of dimethylformamide was then added, and the mixture was heated at 80°-90° C. for 2 hours. The reaction mixture was then cooled and poured onto a mixture of ice and sodium bicarbonate. The mixture was extracted with diethyl ether and the extract was dried over anhydrous potassium carbonate. After evaporation of the solvent, the residue was purified by column chromatography through silica gel eluted with a 1:2 by volume mixture of benzene and hexane, to give 394 mg of 2-(2,4-dichlorophenoxymethyl)-3,4-dihydro-2H-pyran.

1. temperaturethe mixture was heated at 80°-90° C. for 2 hours
2. temperatureThe reaction mixture was then cooled
3. extractionThe mixture was extracted with diethyl ether
4. dry with materialthe extract was dried over anhydrous potassium carbonate
5. customAfter evaporation of the solvent
6. customthe residue was purified by column chromatography through silica gel
7. washeluted with a 1:2 by volume mixture of benzene and hexane

ORDレコード

ord-b01f641e3ceb4fab9f08a7507462b0d4

出典データセット

uspto-grants-1983_12

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US04421758