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A suspension of 3.08 g (7.12 mmol) of benzyl 4-tert-butoxycarbonylmethoxy-[1,4′]bipiperidinyl-1′-carboxylate and 300 mg of 10% Pd/C in 60 mL MeOH was hydrogenated at 50° C. and 50 psi hydrogen pressure for 2 h. The catalyst was removed by suction filtering and the filtrate was evaporated to dryness. The oil remaining was reacted further without purification.

1. customwas hydrogenated at 50° C.
2. customThe catalyst was removed by suction
3. filtrationfiltering
4. customthe filtrate was evaporated to dryness
5. customThe oil remaining was reacted further without purification