反应详情

To a solution of 10 g N-cyanoethylpyrrole in 100 ml ether was added 2.5 g ZnCI2. Dried HCl was passed into the mixture at 5°-10° C. After 2 hours, the reaction mixture was allowed to stand at room temperature for 4 hours. Removed the solvent by suction, 20%. Aqueous NaOH was added until pH 3. The mixture was stirred at 80°-90° C. for 2 hours. Extracted with methylene chloride, dried over Na2SO4, evaporated the solvent, 8 g yellow solid was obtained. The crude product was crystallized from petroleum ether, 6.5 g compound (1) was obtained, as white crystals, mp 53°-54.5° C., yield 65%.

1. customwas passed into the mixture at 5°-10° C
2. waitto stand at room temperature for 4 hours
3. customRemoved the solvent by suction, 20%
4. additionAqueous NaOH was added until pH 3
5. extractionExtracted with methylene chloride
6. dry with materialdried over Na2SO4
7. customevaporated the solvent