反应详情

In a round bottom flask equipped with a Dean-Stark trap was charged ethylene glycol (2.3 mL, 41.1 mmol), 2,4-dichloro-1,3-thiazole-5-carbaldehyde (2.5 g, 13.7 mmol), and toluene (35 mL). To this solution was added 4-methylbenzene-1-sulfonic acid hydrate (210 mg, 1.1 mmol). The reaction mixture was stirred at reflux overnight. After cooling to room temperature, the solution was poured in 10% sodium carbonate solution (50 mL). The mixture was extracted with EtOAc (2×35 mL). The organic extracts were combined, dried over MgSO4, filtered, evaporated, and dried in vacuo, affording 2,4-dichloro-5-(1,3-dioxolan-2-yl)-1,3-thiazole (2.9 g, 93% yield). The product was used without further purification.

1. customIn a round bottom flask equipped with a Dean-Stark trap
2. temperatureat reflux overnight
3. extractionThe mixture was extracted with EtOAc (2×35 mL)
4. dry with materialdried over MgSO4
5. filtrationfiltered
6. customevaporated
7. customdried in vacuo