反应详情

To a solution of (1H-indazol-5-yl)(phenyl)methanol (180 mg, 0.71 mmol) and (1-methoxyprop-1-enyloxy)trimethylsilane (0.32 mL, 1.78 mmol) in 10 mL of dry MeCN was added TiCl4 (2.5 mL of 1.0 M DCM solution, 2.5 mmol) and then stirred 1 h. The reaction was incomplete so added 10 mL of DCM and additional (1-methoxyprop-1-enyloxy)trimethylsilane (0.3 mL, 1.7 mmol) After 1 h, the reaction was quenched with MeOH, poured into aqueous sodium bicarbonate and extracted 2×EtOAc. The organic layers were dried over MgSO4, filtered, and concentrated. HPLC purification resulted in the resolution of the two diastereomers of methyl 3-(1H-indazol-5-yl)-2-methyl-3-phenylpropanoate which were taken independently to the next step. MS found: (M+H)+=295.

1. customAfter 1 h
2. customthe reaction was quenched with MeOH
3. additionpoured into aqueous sodium bicarbonate
4. extractionextracted 2×EtOAc
5. dry with materialThe organic layers were dried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated
8. customHPLC purification