反应详情

温度

-78 °C

1.51 Grams of 2,2'-pentamethylenebis[1,4-dimethoxy- 3,6-bis(methoxymethoxy)benzene] was dissolved in a mixed solvent of 40 ml of tetrahydrofuran with 4 ml of hexamethylphosphoric triamide, to this solution was added 0.55 ml of N,N,N',N'-tetramethylethylenediamine and the whole mixture was cooled to -78° C., on a dry ice-acetone bath. Then, 2.41 ml of n-butyllithium (1.6 M, n-hexane solution) was added dropwise to the reaction mixture and stirred for 30 minutes. Next, 0.25 ml of dimethyl sulfide was added to the reaction mixture and stirred overnight. The solvent was removed by evaporation under reduced pressure, then the residue obtained was extracted twice with 100 ml of ethyl acetate, then the ethyl acetate layer was washed twice with 100 ml of water, and twice with a saturated sodium chloride aqueous solution, then dried over anhydrous magnesium sulfate. The solvent was removed by evaporation under reduced pressure, and the residue obtained was purified by means of a preparative thin layer chromatography (thickness: 2 mm, adsorbent: Merck Art 5717 silica gel, developing solvent: 20% ethyl acetate-n-hexane). There were obtained 572 mg of 1-[2,5-dimethoxy-3,6-bis(methoxymethoxy)phenyl]5-[2,5-dimethoxy-3,6-bis(methoxymethoxy)-4-(methylthio)phenyl]pentane, as well as 522 mg of 2,2'-pentamethylenebis[1,4-dimethoxy-3,6-bis(methoxymethoxy)-5-(methylthio)benzene].

1. stirringstirred overnight
2. customThe solvent was removed by evaporation under reduced pressure
3. customthe residue obtained
4. extractionwas extracted twice with 100 ml of ethyl acetate
5. washthe ethyl acetate layer was washed twice with 100 ml of water
6. dry with materialtwice with a saturated sodium chloride aqueous solution, then dried over anhydrous magnesium sulfate
7. customThe solvent was removed by evaporation under reduced pressure
8. customthe residue obtained
9. customwas purified by means of a preparative thin layer chromatography (thickness: 2 mm, adsorbent: Merck Art 5717 silica gel, developing solvent: 20% ethyl acetate-n-hexane)