反应详情

A solution of 10.0 g (50.2 mmol) of 4-oxo-piperidine-1-carboxylic acid tert-butyl ester and 6.00 ml=6.15 g (60.2 mmol) of (S)-(−)-pyrrolidin-2-yl-methanol in 100.0 ml of EtOH was treated with 100.0 ml of 1,2-dichloroethane, followed by 7.53 ml (60.2 mmol) of borane-pyridine complex (8 molar). Then, 7.46 ml=7.84 g (130.5 mmol) of acetic acid was added to this solution. After stirring at RT for 16 hours, the reaction mixture was poured into crashed ice; then, the pH was adjusted to 9-10 with sodium carbonate solution and the mixture was extracted twice with EtOAc; the combined organic phases were washed with water, dried over MgSO4, filtered and evaporated. The residue was purified by flash column chromatography (CH2Cl2/MeOH 1:0 to 9:1) to give 10.4 g (73%) of the title compound as light yellow oil. MS: 285.1 (MH+).

1. additionthe reaction mixture was poured
2. extractionthe mixture was extracted twice with EtOAc
3. washthe combined organic phases were washed with water
4. dry with materialdried over MgSO4
5. filtrationfiltered
6. customevaporated
7. customThe residue was purified by flash column chromatography (CH2Cl2/MeOH 1:0 to 9:1)