反应详情

(2-Methoxy-4-nitro-phenyl)-piperidin-1-yl-methanone (Stage 87.3; 200 mg, 0.76 mmol) is dissolved in THF (8 ml) at −20° C. DIBAH (1 M in THF: 2.3 ml) then is added. After 90 min at −20° C., another portion of DIBAH (0.8 ml) is added and stirring continued for 2 h. Then the reaction mixture is hydrolysed by water (30 ml) and a saturated solution of sodium potassium tartrate (25 ml) and extracted 3 times with AcOEt. The organic phases are washed with brine, dried (Na2SO4) and concentrated. The crude product is dissolved in AcOEt, SiO2 is then added and the solvent evaporate off in vacuo. The resulting powder is put on top of a chromatography column (SiO2; AcOEt) and the title compound eluated with AcOEt: 1H-NMR (DMSO-d6): 7.83 (dd, 1H), 7.73 (d, 1H), 7.60 (d, 1H), 3.91 (s, H3CO), 3.49 (s, 2H), 2.36 (m, 4H), 1.52 (m, 4H), 1.39 (m, 2H).

1. waitcontinued for 2 h
2. extractiona saturated solution of sodium potassium tartrate (25 ml) and extracted 3 times with AcOEt
3. washThe organic phases are washed with brine
4. dry with materialdried (Na2SO4)
5. concentrationconcentrated
6. dissolutionThe crude product is dissolved in AcOEt
7. additionSiO2 is then added
8. customthe solvent evaporate off in vacuo