Ammonium Chloride → 2-Pyridinecarboxylic acid, 5-[4-[[1-[2-fluoro-3-(hydroxymethyl)phenyl]-3-azetidinyl]oxy]-1-piperidinyl]-, methyl ester

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Reaction Conditions

Reaction Steps

4-({1-[3-({[tert-Butyl(dimethyl)silyl]oxy}methyl)-2-fluorophenyl]azetidin-3-yl}oxy)piperidine (250 mg) and dioxane (7 ml) were mixed, and methyl 5-bromopyridine-2-carboxylate (170 mg), palladium acetate (II)(15 mg), dicyclohexyl(2′,4′,6′-triisopropylbiphenyl-2-yl)phosphine (60 mg), and tripotassium phosphate (400 mg) were added thereto, followed by stirring 100° C. for 48 hours. The reaction mixture was cooled to room temperature, and filtered by the addition of CHCl3 and Celite, and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography (hexane/EtOAc). The purified product thus obtained was mixed with THF (5 ml), and a 1.0 M TBAF/THF solution (0.63 ml) was added thereto, followed by stirring at room temperature for 1 hour. A saturated aqueous ammonium chloride solution and CHCl3 were added to the reaction mixture, and the organic layer was dried over Na2SO4 and then concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (CHCl3/MeOH) to obtain methyl 5-[4-({1-[2-fluoro-3-(hydroxymethyl)phenyl]azetidin-3-yl}oxy)piperidin-1-yl]pyridine-2-carboxylate (92 mg).

Provenance & Evidence