反应详情

To a solution of (R)-tert-butyl 3-((R)-(5-chloro-2-methylphenyl)(2-hydroxyethoxy)methyl)piperidine-1-carboxylate (7 g, 18.3 mmol) in dry CH2Cl2 (100 mL) was added Et3N (54 g, 10 mL, 0.73 mmol) at −5-0° C. Then a solution of MsCl (4.2 g, 36.5 mmol) in dry CH2Cl2 (50 mL) was added dropwise at the same temperature. After addition, it was allowed to warm to rt gradually. The reaction mixture was washed with 10% citric acid solution (30 mL), NaHCO3 and brine, then dried over Na2SO4, filtered and concentrated to give (R)-tert-butyl 3-((R)-(5-chloro-2-methylphenyl)(2-(methylsulfonyloxy)ethoxy)methyl)piperidine-1-carboxylate (8.4 g), which was used in the next step without purification.

1. additionAfter addition, it
2. washThe reaction mixture was washed with 10% citric acid solution (30 mL), NaHCO3 and brine
3. dry with materialdried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated