反应详情

Diisopropyl azodicarboxylate (2.36 mL) was added to a solution of 4-(benzyloxy)phenol (2.0 g), tert-butyl 4 hydroxypiperidine-1-carboxylate (2.41 g) and triphenylphosphine (3.67 g) in dichloromethane (30 mL). The reaction mixture was stirred at ambient temperature for 18 hours and then concentrated at reduced pressure. This resulting mixture was purified by silica column chromatography, eluting with a gradient of 0 to 20% ethyl acetate in hexane to give tert-butyl 4-[4-(benzyloxy)phenoxy]piperidine-1-carboxylate as a light orange oil (3.25 g); NMR Spectrum: (CDCl3) 1.47 (s, 9H), 1.65-1.77 (m, 2H), 1.83-1.93 (m, 2H), 3.24-3.34 (m, 2H), 3.65-3.76 (m, 2H), 4.27-4.35 (m, 1H), 5.01 (s, 2H), 6.80-6.93 (m, 4H), 7.28-7.45 (m, 5H); Mass Spectrum: (M-tBuOCO)+H+ 284.

1. concentrationconcentrated at reduced pressure
2. customThis resulting mixture was purified by silica column chromatography
3. washeluting with a gradient of 0 to 20% ethyl acetate in hexane