1,2-Dimethoxyethane → 4-[2-(3,3,5,5-Tetramethylcyclohexyl)phenyl]-3,6-dihydro-2H-pyridine-1-carboxylic acid t-butyl ester

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To a mixture of trifluoromethanesulfonic acid 2-(3,3,5,5-tetramethylcyclohexyl)phenyl ester (830 mg, 2.55 mmol) produced in Example (102c), 4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-3,6-dihydro-2H-pyridine-1-carboxylic acid t-butyl ester (631 mg, 2.04 mmol) (Paul R. Eastwood, Tetrahedron Lett., 2000, 41, 3705) and 1,2-dimethoxyethane (20 mL) were added tetrakis(triphenylphosphine)palladium (147 mg, 0.13 mmol) and 2N aqueous solution of sodium carbonate (3.8 mL, 7.6 mmol), followed by stirring for 8 hours at an external temperature of 90° C. under a nitrogen atmosphere. Brine was added to the reaction mixture and extraction was performed with ethyl acetate. The organic layer was dried over anhydrous magnesium sulfate and the filtrate was concentrated under reduced pressure. The resultant residue was purified by silica gel column chromatography (ethyl acetate/heptane) to give 570 mg of the title compound as a light yellow oil.

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