In 30 ml of N,N-dimethylformamide were dissolved 0.89 g (2.5 mmol) of 3-trifluoromethanesulfonyloxy-5H-dibenzo[a,d]cyclohepten-5-one and 0.48 g (2.5 mmol) of 7-chloro-2-vinyl quinoline, and then, 100 mg (0.5 mmol) of palladium acetate, 420 mg (1.6 mmol) of triphenylphosphine and 2.1 g (24 mmol) of lithium bromide were added to the mixture and the atmosphere thereof was made nitrogen. Then, 5.0 ml (36 mmol) of triethylamine was added to the mixture, and the resulting mixture was stirred under nitrogen atmosphere at 120° C. for 10 hours.
