650 mg of 4-benzyl-5-bromo-2-pyridyl trifluoromethanesulfonate (Production Example 1), 115 mg of 1-butyne-3-ol, 100 mg of tetrakis(triphenylphosphine)palladium(0), 30 mg of cuprous iodide and 1 ml of triethylamine were mixed with 5 ml of N,N-dimethylformamide, followed by stirring for one hour in an oil bath kept at 60° C. After cooling as it was, aqueous ammonia was added thereto and the mixture was extracted with ethyl acetate. The extract was washed with brine and then evaporated. The residue was subjected to silica gel column chromatography and eluted with 30% ethyl acetate/hexane, to give 410 mg of the target compound.
