反应详情

温度

0 °C

To a solution of methyl (±)-3-(5-methylthiazol-2-yl)-4-(4-benzyloxyphenyl)butanoate (0.99 mmole, crude) in EtSH (5 mL) at RT was added BF3 OEt2 (0.6 mL). After 18 hr. additional BF3.OEt2 (0.6 mL) was added. After another 18 hr, the mixture was cooled to 0° C. and carefully quenched with saturated NaHCO3. The resulting mixture was extracted with CH2Cl2 (3×25 mL). The combined organic layers were dried over MgSO4, filtered, and concentrated. The residue was chromatographed on silica gel (50% EtOAc/hexanes) to give the title compound (249 mg, 86% over 3 steps) as a yellow solid: MS (ES) m/e 292 (M+H)+.

1. waitAfter another 18 hr
2. customcarefully quenched with saturated NaHCO3
3. extractionThe resulting mixture was extracted with CH2Cl2 (3×25 mL)
4. dry with materialThe combined organic layers were dried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated
7. customThe residue was chromatographed on silica gel (50% EtOAc/hexanes)