反应详情

A mixture of (3R,4R)-tert-butyl 3-hydroxy-4-(4-hydroxyphenyl)piperidine-1-carboxylate (620 mg, 2.1 mmol, E-2 from step E), potassium carbonate (584 mg, 4.2 mmol), and benzyl bromide (0.25 mL, 2.1 mmol) in DMF (5 mL) was stirred at rt for 16 h. The solvent was removed by evaporation and the residue was treated with 50 mL of water. The aqueous mixture was then extracted 4 times with 50 mL of chloroform. The combined organic phases were dried over anhydous Na2SO4, filtered, and evaporated to yield 750 mg of (3R,4R)-tert-butyl 4-(4-(benzyloxy)phenyl)-3-hydroxypiperidine-1-carboxylate which was used without further purification. LCMS (method F) RT 2.28 min, m/z=310 (M+H+−t-butyl −water), 328 (M+H+−t-butyl).

1. customThe solvent was removed by evaporation
2. additionthe residue was treated with 50 mL of water
3. extractionThe aqueous mixture was then extracted 4 times with 50 mL of chloroform
4. dry with materialThe combined organic phases were dried over anhydous Na2SO4
5. filtrationfiltered
6. customevaporated