反应详情

Methoxytrimethylsilane (545 mg, 5.23 mmol) and trimethylsilyl trifluoromethanesulfonate (30 mg, 0.13 mmol) were added to a solution of 2-(4-fluorophenyl)oxazole-4-carbaldehyde (500 mg, 2.62 mmol) in dry CH2Cl2 (2 mL) at −78° C. The reaction mixture was allowed to warm up to room temperature and stirred for 24 h, quenched with saturated aqueous NaHCO3 solution, and the crude product was extracted with EtOAc. The organic layer was washed with 10% NaHCO3 solution, water and brine and dried over anhydrous sodium sulfate. Solvent was removed under reduced pressure to get 4-(dimethoxymethyl)-2-(4-fluorophenyl)oxazole (400 mg, crude), which was carried through without further purification. 1H NMR (400 MHz, CDCl3) δ 8.08-8.05 (m, 2H), 7.71 (d, J=1.2 Hz, 1H), 7.16-7.12 (m, 2H), 5.50 (d, J=0.9 Hz, 1H), 3.41 (s, 6H). MS (ESI) m/z: Calculated for C12H12FNO3: 237.08. found: 259.9 (M+Na)+.

1. customquenched with saturated aqueous NaHCO3 solution
2. extractionthe crude product was extracted with EtOAc
3. washThe organic layer was washed with 10% NaHCO3 solution, water and brine
4. dry with materialdried over anhydrous sodium sulfate
5. customSolvent was removed under reduced pressure