反应详情

To a 250 mL round-bottom flask was added 4-(trifluoromethyl)benzaldehyde (4.50 g, 25.84 mmol), methanol (100 mL), p-toluene sulfonylmethyl isocyanide (5.55 g, 28.42 mmol), followed by potassium carbonate (4.60 g, 33.33 mmol). The reaction mixture was stirred at reflux for about 1 hour and followed by TLC. The solvent was then evaporated and saturated aq.NaHCO3 was added. The resultant suspension was extracted with CH2Cl2 (3×20 mL). Combined organic layers were washed with brine, dried (anhydrous Na2SO4), and concentrated to leave a yellow solid. The product was purified by MPLC column chromatography (Biotage; Acetone/hexane as an eluent) to provide 5-(4-(trifluoromethyl)phenyl)oxazole 30 (5.38 g, 98% yield) as white solid. MS (ES) m/z 214 (M+H+).

1. temperatureat reflux for about 1 hour
2. customThe solvent was then evaporated
3. additionNaHCO3 was added
4. extractionThe resultant suspension was extracted with CH2Cl2 (3×20 mL)
5. washCombined organic layers were washed with brine
6. dry with materialdried (anhydrous Na2SO4)
7. concentrationconcentrated
8. customto leave a yellow solid
9. customThe product was purified by MPLC column chromatography (Biotage