反应详情

Benzyl 4-(2-(3,3-difluoroazetidin-1-yl)-2-oxoethoxy)piperidine-1-carboxylate (87) (2.59 g, 7.03 mmol) and palladium on carbon (0.075 g, 0.70 mmol) were added to ethanol (40 mL). This was stirred for 3 hours under an atmosphere of H2 (1.417 g, 703.09 mmol). The reaction was filtered and the solvent evaporated to afford a viscous clear oil. The crude product was purified by distillation at 0.5 mBar, collecting fractions that distilled at 90° C. to afford the desired material as a colourless oil (0.540 g, 32.8% yield); 1H NMR (400.132 MHz, CDCl3) δ 1.49-1.40 (2H, m), 1.94-1.89 (2H, m), 2.65-2.59 (2H, m), 3.10-3.05 (2H, m), 3.44-3.38 (1H, m), 4.13 (2H, s), 4.35 (2H, t), 4.64 (2H, t); NH missing

1. filtrationThe reaction was filtered
2. customthe solvent evaporated
3. customto afford a viscous clear oil
4. distillationThe crude product was purified by distillation at 0.5 mBar
5. customcollecting fractions
6. distillationthat distilled at 90° C.