反应详情

Piperidin-4-ylmethanol (2.50 g, 21.7 mmol), t-butylchlorodimethylsilane (4.13 g, 23.9 mmol), and imidazole (1.48 g, 21.7 mmol) were dissolved in dichloromethane (25 mL) and stirred at room temperature for 18 hours. The reaction was added to aqueous NaHCO3 (200 mL, 50% saturated) and extracted with dichloromethane (3×150 mL). The combined organics were dried (MgSO4) and evaporated to give a yellow oil. Silica gel chromatography (gradient elution dichloromethane+2.5% TEA/0-10% methanol) gave a soft white solid, which was then added to 0.5 M NaOH (100 mL) and extracted with dichloromethane+10% methanol (3×100 mL). The combined organics were dried (MgSO4) and evaporated to give compound 284 as a pale yellow oil (4.75 g).

1. extractionextracted with dichloromethane (3×150 mL)
2. dry with materialThe combined organics were dried (MgSO4)
3. customevaporated
4. customto give a yellow oil
5. washSilica gel chromatography (gradient elution dichloromethane+2.5% TEA/0-10% methanol)
6. customgave a soft white solid, which
7. extractionextracted with dichloromethane+10% methanol (3×100 mL)
8. dry with materialThe combined organics were dried (MgSO4)
9. customevaporated