abstract |
The invention relates to a method for the preparation of (1R,2S,4R)-(-)-2-[(2'-{N,N-dimethylamino}-ethoxy)]-2-[phenyl]-1,7, 7-tri-[methyl]-bicyclo[2,2,1]heptane and its pharmaceutically acceptable with acid salts of higher yields and increased degrees of purity. 10 claims |