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温度

0 °C

To a solution of 4-(1-{[(phenylmethyl)oxy]carbonyl}-3-piperidinyl)butanoic acid (5.01 g, 16.41 mmol) in dry THF (40 ml) at 0° C. under nitrogen was added a solution of Borane-THF complex, (1M soln. in THF) (49.2 ml, 49.2 mmol), dropwise over 1 hour. The mixture was allowed to stir at 0° C. and gradually allowed to warm to rt over 20 hours. The mixture was cooled in an ice bath and cautiously quenched with dropwise addition of MeOH (20 ml) stirred in the cold bath for 2 hours then quenched further with 10% 2N HCl/MeOH (20 ml), stirred for 1 hour at rt and evaporated under reduced pressure. The residue was co-evaporated with methanol several times. The sample was purified by chromatography on silica (100 g, loaded in dichloromethane/EtOAc) using a gradient of 0-100% ethyl acetate in cyclohexane over 30 mins. collecting all 45 ml fractions on the Flashmaster II. The appropriate fractions were combined and evaporated in vacuo to give the title compound as a colourless oil (4.55 g).

1. temperatureto warm to rt over 20 hours
2. temperatureThe mixture was cooled in an ice bath
3. customcautiously quenched with dropwise addition of MeOH (20 ml)
4. stirringstirred in the cold bath for 2 hours
5. customthen quenched further with 10% 2N HCl/MeOH (20 ml)
6. stirringstirred for 1 hour at rt
7. customevaporated under reduced pressure
8. customThe sample was purified by chromatography on silica (100 g, loaded in dichloromethane/EtOAc)
9. customover 30 mins
10. customcollecting all 45 ml fractions on the Flashmaster II
11. customevaporated in vacuo