反应详情

2-Methyl-5-phenyl-oxazole (1.6 g, 10 mmol), prepared according to the literature procedure (Varma, R. S.; Kumar, D. J. Heterocyclic Chem., 1998, 35,1533), was dissolved in chlorosulfonic acid (10 mL) and stirred at room temperature for 16 h. The reaction mixture was added to crushed ice (50 g) and the product was extracted with ether (3×50 mL). The combined organic extract was dried over anhydrous Na2SO4 and ether was evaporated. The product was purified by flash chromatography (silica-gel, 5-20% ethylacetate/hexane mobile phase) to yield 0.82 g of the desired title compound as tan solid. MS: m/z 258.0 (M++1).

1. additionThe reaction mixture was added
2. extractionthe product was extracted with ether (3×50 mL)
3. extractionThe combined organic extract
4. dry with materialwas dried over anhydrous Na2SO4 and ether
5. customwas evaporated
6. customThe product was purified by flash chromatography (silica-gel, 5-20% ethylacetate/hexane mobile phase)