Triphenylphosphine → {2-Fluoro-3-[4-(pyridin-4-yloxy)piperidin-1-yl]phenyl}methanol

Participants

Reaction Conditions

Reaction Steps

1-[3-({[tert-Butyl(dimethyl)silyl]oxy}methyl)-2-fluorophenyl]piperidin-4-ol (200 mg) and pyridin-4-ol (65 mg) were mixed with THF (3 ml), and triphenylphosphine (250 mg) was added thereto. A 1.9M DIAD/toluene solution (0.5 ml) was added dropwise to the reaction mixture, followed by stirring at 55° C. overnight. Then, a 1M TBAF/THF solution (1 ml) was added to the reaction mixture, followed by stirring at room temperature for 1 hour. The reaction mixture was concentrated under reduced pressure, and diethyl ether and 1M hydrochloric acid were added thereto. The organic layer was separated by a liquid separation operation, and the aqueous layer was washed with diethyl ether twice again. The aqueous layer was adjusted to a pH of around 10 by the addition of a 4 M aqueous NaOH solution, and extracted with CHCl3. The organic layer was dried over Na2SO4 and concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (CHCl3/MeOH) to obtain {2-fluoro-3-[4-(pyridin-4-yloxy)piperidin-1-yl]phenyl}methanol (84 mg).

Provenance & Evidence