3.58 g (18.7 mmol) of EDC, 2.52 g (18.7 mmol) of HOBt and 7.8 ml (56 mmol) of triethylamine are added to a solution, cooled to 0° C., of 4.0 g (15.6 mmol) of 7-bromo-1-benzothiophene-2-carboxylic acid (Example 7A) and 3.10 g (15.6 mmol) of (S)-3-aminoquinuclidine dihydrochloride in 50 ml of DMF. The mixture is stirred at room temperature for 18 h. The reaction is stopped by adding 10% strength sodium bicarbonate solution. The precipitate resulting after addition of ethyl acetate is filtered off. The aqueous phase is extracted with ethyl acetate, the combined organic phases are dried over sodium sulphate and concentrated, and the residue is dried under high vacuum. 4.70 g (68% of theory) of the title compound are obtained. The spectroscopic data agree with those of the enantiomeric compound (Example 8A).
