To a suspension of 6 parts of 2-methoxy-4-acetylamino-5-chloro benzoic acid in 50 parts of anhydrous tetrahydrofuran, were added 2.5 parts of triethylamine. The solution thus obtained was poured portionwise in a mixture of 2.7 parts of ethyl chloroformate in 80 parts of tetrahydrofuran maintained at 0° C. After stirring for 10 minutes, 4.1. parts of N-ethyl-2-aminomethyl-3-azabicyclo (3,3,0) octane were added. After being maintained at room temperature for 10 minutes, the temperature was progressively increased and, finally, the reaction mixture was refluxed for 60 minutes. After cooling, the mixture was filtered and the filtrate was evaporated in vacuo. After recrystallization in 50 parts of ethyl acetate, there were obtained 5.5 parts of N-ethyl-2-(2-methoxy-4-acetylamino-5-chloro benzamido methyl)-3-azabicyclo (3,3,0) octane, M.P. 156°-157° C (ethyl acetate).
