Piperidine → 4-(Piperidine-1-carbonyloxy)-piperidine-1-carboxylic acid 6-[(4-phenoxy-phenyl)oxycarbonylamino]-hexyl ester

Beteiligte Stoffe

Reaktionsschritte

A solution of piperidine (382 μl, 3.86 mmol) and triethylamine (2.24 mL, 16.1 mmol) in 30 mL of methylene chloride was added under nitrogen dropwise to a solution of the carbonate prepared in Example 5 (2.0 g, 3.22 mmol) in 30 mL of methylene chloride at ice bath temperature. After the addition the cooling bath was removed and the reaction stirred at room temperature overnight. The reaction was extracted one time with 1N HCl, multiple times with saturated Na2CO3, dried (MgSO4) and the solvent removed under reduced pressure to give 1.85 g of an oil. Purification of the oil on silica gel (230-400 mesh) using 5%-20% ethyl acetate-methylene chloride as the eluent gave 1.23 g (68%) of the title compound as a white crystalline solid, mp 56°-61° C.

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