Triphenylphosphine → tert-butyl N-{3-[1-(4-pyridyl)piperidin-4-yloxy]phenyl}carbamate

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Diethyl azodicarboxylate (3 ml) was added over 15 minutes to a stirred mixture of 1-(4-pyridyl)piperidin-4-ol (3.39 g), 3-(N-tert-butoxycarbonylamino)phenol (Chemical Abstracts, vol. 119, abstract 139113; PCT Patent Application WO 9306085; 3.98 g), triphenylphosphine (4.99 g) and THF (150 ml) which had been cooled to 4° C. The resultant mixture was stirred for 48 hours at ambient temperature. The solvent was evaporated and the residue was purified by column chromatography using a 9:1 mixture of methylene chloride and methanol as eluent. The resultant foam was crystallised from diethyl ether to give tert-butyl N-{3-[1-(4-pyridyl)piperidin-4-yloxy]phenyl}carbamate (4.65 g), m.p. 165-166° C.

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