反应详情

Potassium tert-butoxide (3.49 g, 35.1 mmol) was added to a solution of methyl 3-formyl-4,5-dimethylpyrrole-2-carboxylate (5.79 g, 31.9 mmol) and 18-crown-6 (0.41 g, 1.55 mmol) in tetrahydrofuran (130 ml) and the mixture was stirred at room temperature for 1 hour. After dropwise addition over 30 minutes of (1S,2S)-2-methylcyclopropylmethyl bromide (5.71 g, 38.3 mmol) to the reaction mixture at 50° C., the mixture was heated under reflux for 3 hours. Potassium tert-butoxide (0.36 g, 3.22 mmol) and (1S,2S)-2-methylcyclopropylmethyl bromide (0.48 g, 3.21 mmol) were further added to the mixture and this mixture was heated for 1 hour. The reaction mixture was poured into ice-water and extracted with ethyl acetate. The extract was washed with water and a saturated aqueous sodium chloride solution and then dried over anhydrous magnesium sulfate. The solvent was removed in vacuo to afford the desired compound (8.26 g, 100%) as a pale brown oil.

1. temperaturethe mixture was heated
2. temperatureunder reflux for 3 hours
3. temperaturethis mixture was heated for 1 hour
4. extractionextracted with ethyl acetate
5. washThe extract was washed with water
6. dry with materiala saturated aqueous sodium chloride solution and then dried over anhydrous magnesium sulfate
7. customThe solvent was removed in vacuo