反应详情

To a solution of 1,1-dimethylethyl 4-({[5-(hydroxymethyl)-2-(methyloxy) phenyl]oxy}methyl)piperidine-1-carboxylate (1.88 g, 5.4 mmol) in dichloromethane (14 mL) was added triethylamine (2.3 mL, 16.2 mmol). The resulting mixture was cooled with an ice bath, and methanesulfonyl chloride (0.84 mL, 10.8 mmol) was added dropwise. The mixture was allowed to warm to room temperature and a white precipitate formed. After 2.5 h, the solvent was removed and the residue was dissolved in water, which was subsequently extracted twice with ethyl acetate. The organic layers were combined, dried over sodium sulfate, filtered, and concentrated to provide a yellow oil. To the oil was added DMF (10 mL) and potassium cyanide (703 mg, 10.8 mmol). The resulting mixture was stirred at rt for 15 h. Water was then added, and the aqueous mixture was extracted twice with ethyl acetate. The organic layers were combined, washed with brine, dried over sodium sulfate, filtered, and concentrated. The residue was purified by flash chromatography (60% hexanes, 40% ethyl acetate) to provide 800 mg of 1,1-dimethylethyl 4-({[5-(cyanomethyl)-2-(methyloxy)phenyl]oxy}methyl)piperidine-1-carboxylate (2.2 mmol, 41% yield). 1H NMR (400 MHz, CDCl3): δ6.89-6.81 (m, 3H), 4.15 (br m, 2H), 3.86 (s, 3H), 3.86-3.83 (m, 2H), 3.69 (s, 2H), 2.76 (br m, 2H), 2.10-2.00 (m, 1H), 1.87 (br d, 2H), 1.47 (s, 9H), 1.31-1.20 (m, 2H); MS (EI) for C20H28N2O4: 383 (MNa+).

1. temperatureThe resulting mixture was cooled with an ice bath
2. customa white precipitate formed
3. customthe solvent was removed
4. dissolutionthe residue was dissolved in water
5. extractionwhich was subsequently extracted twice with ethyl acetate
6. dry with materialdried over sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated
9. customto provide a yellow oil
10. extractionthe aqueous mixture was extracted twice with ethyl acetate
11. washwashed with brine
12. dry with materialdried over sodium sulfate
13. filtrationfiltered
14. concentrationconcentrated
15. customThe residue was purified by flash chromatography (60% hexanes, 40% ethyl acetate)