反应详情

To a solution of hexaethylene glycol (8.46 grams, 30 mmoles) in 250 ml dry pyridine, a solution of 4,4-dimethoxytrityl chloride (3.38 grams, 10 mmoles) in 50 ml dry pyridine was added dropwise at room temperature. The resulting solution was stirred at room temperature for additional 5 hours. The solvent was then evaporated to dryness, and the residue was extracted with 200 ml ethylacetate/200 ml 5% sodium bicarbonate solution, washed twice with water and twice with brine solution. The obtained organic layer was dried over anhydrous sodium sulfate, evaporated and purified by silica gel column chromatography using 5% methanol in dichloromethane, 0.5% pyridine. The resulting 4,4-dimethoxytrityl-hexaethylene glycol compound (5.23 grams, 89% yield) migrated with Rf=0.29.

1. customThe solvent was then evaporated to dryness
2. extractionthe residue was extracted with 200 ml ethylacetate/200 ml 5% sodium bicarbonate solution
3. washwashed twice with water and twice with brine solution
4. dry with materialThe obtained organic layer was dried over anhydrous sodium sulfate
5. customevaporated
6. custompurified by silica gel column chromatography