Cesium fluoride → 4-[4-Pyridin-2-yl-2-(3,3,5,5-tetramethylcyclohexyl)phenyl]piperazine-1-carboxylic acid t-butyl ester

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Reaction Conditions

Reaction Steps

To a mixture of 4-[4-bromo-2-(3,3,5,5-tetramethylcyclohexyl)phenyl]piperazine-1-carboxylic acid t-butyl ester (100 mg, 0.209 mmol) produced in Example (99a), 2-(tributyltin)pyridine (0.08 mL, 0.25 mmol), cesium fluoride (68 mg, 0.448 mmol) and dioxane (15 mL) was added tetrakis(triphenylphosphine)palladium(0) (25 mg, 0.022 mmol), followed by stirring for 3 hours at an external temperature of 90° C. under a nitrogen atmosphere. Ethyl acetate was added to the reaction mixture, insoluble materials were filtered off, and the filtrate was concentrated under reduced pressure. The resultant residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give 43 mg of the title compound as light yellow crystals.

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