反应详情

4-(2-Carboxyphenyl)piperidine-1-carboxylic acid t-butyl ester (5.0 g, 16 mmol, 1.0 eq.) and THF (130 mL, 1.7 mol) were combined at room temperature under nitrogen. Borane dimethyl sulfide complex (2.9 mL, 33 mmol, 2.0 eq.) was added dropwise and the mixture was stirred for 5 minutes, then heated at reflux for 1 hour. The mixture was cooled to room temperature, and the reaction was quenched dropwise with MeOH (40 mL), then concentrated by rotary evaporation. The material was azeotroped with MeOH (2×40 mL). The mixture was then diluted with EtOAc (100 mL), and washed with 1 M HCl (2×50 mL), then NaHCO3 (2×50 mL), then saturated aqueous NaCl (1×50 mL). The organic layer was dried over anhydrous Na2SO4, filtered, and concentrated in vacuo to yield 4-(2-hydroxymethylphenyl)piperidine-1-carboxylic acid t-butyl ester (4.8 g) as a clear, light yellow oil that solidified upon sitting.

1. customwere combined at room temperature under nitrogen
2. additionBorane dimethyl sulfide complex (2.9 mL, 33 mmol, 2.0 eq.) was added dropwise
3. temperatureheated
4. temperatureat reflux for 1 hour
5. customthe reaction was quenched dropwise with MeOH (40 mL)
6. concentrationconcentrated by rotary evaporation
7. customThe material was azeotroped with MeOH (2×40 mL)
8. additionThe mixture was then diluted with EtOAc (100 mL)
9. washwashed with 1 M HCl (2×50 mL)
10. dry with materialThe organic layer was dried over anhydrous Na2SO4
11. filtrationfiltered
12. concentrationconcentrated in vacuo