反应详情

To a solution of methyl 6-cyclohexyl-5-[2-(2-hydroxyethyloxy)-3-nitrophenyl]-4H-thieno[3,2-b]pyrrole-2-carboxylate (628 mg, 1.41 mmol) in chloroform (10 ml) were added triethylamine (0.230 ml, 1.65 mmol) and methanesulfonyl chloride (0.120 ml, 1.55 mmol) in this order under ice-cooling, and the mixture was stirred at room temperature for 1 hr. Water was added to the reaction mixture, and the mixture was extracted with chloroform. The organic layer was washed with 1N hydrochloric acid, saturated aqueous sodium hydrogen carbonate solution and saturated brine in this order, and dried over anhydrous sodium sulfate. After filtration, the solvent was evaporated under reduced pressure. The obtained methyl 6-cyclohexyl-5-[2-(2-methanesulfonyloxyethoxy)-3-nitrophenyl]-4H-thieno[3,2-b]pyrrole-2-carboxylate was used for Step 5 without further purification.

1. temperaturecooling
2. extractionthe mixture was extracted with chloroform
3. washThe organic layer was washed with 1N hydrochloric acid, saturated aqueous sodium hydrogen carbonate solution and saturated brine in this order
4. dry with materialdried over anhydrous sodium sulfate
5. filtrationAfter filtration
6. customthe solvent was evaporated under reduced pressure
7. customThe obtained methyl 6-cyclohexyl-5-[2-(2-methanesulfonyloxyethoxy)-3-nitrophenyl]-4H-thieno[3,2-b]pyrrole-2-carboxylate was used for Step 5 without further purification