反应详情

To a solution of (R)-tert-butyl 4-((5-hydroxyhexyl)oxy)-4-methylpiperidine-1-carboxylate (4.5 g, 14.27 mmol) in DMF (50 mL) at 0° C. was added 60% NaH (0.685 g, 17.12 mmol) and the resulting mixture was stirred at room temp for 1 h. Benzyl bromide (2.55 mL, 21.40 mmol) was then added and the mixture was stirred for 16 h. Water (20 mL) was then added and the mixture was extracted with ether (100 mL), washed with brine (25 ml), dried (Na2SO4), filtered and concentrated. The residue was then purified by Biotage (0-20% EtOAc/hexane) to afford (R)-tert-butyl 4-((5-(benzyloxy)hexyl)oxy)-4-methylpiperidine-1-carboxylate (3.5 g, 8.63 mmol, 60.5% yield) as light yellow oil. 1H NMR (500 MHz, CDCl3) δ 7.38-7.35 (m, 4H), 7.31-7.25 (m, 1H), 4.60 (d, J=11.8 Hz, 1H), 4.48 (d, J=11.8 Hz, 1H), 3.86-3.62 (m, 3H), 3.58-3.50 (m, 1H), 3.31 (t, J=6.3 Hz, 2H), 3.14 (br. s., 2H), 1.74 (d, J=12.9 Hz, 2H), 1.59-1.51 (m, 3H), 1.47 (s, 9H), 1.46-1.37 (m, 4H), 1.22 (d, J=6.1 Hz, 3H), 1.17 (s, 3H). LCMS (M+H)=406.3.

1. stirringthe mixture was stirred for 16 h
2. extractionthe mixture was extracted with ether (100 mL)
3. washwashed with brine (25 ml)
4. dry with materialdried (Na2SO4)
5. filtrationfiltered
6. concentrationconcentrated
7. customThe residue was then purified by Biotage (0-20% EtOAc/hexane)