METHOD FOR PRODUCING (1R, 2S, 4R) - (-) - 2- (2 '- (N, N-DIMETHYLAMINO) -ETHOXY) -2- PHENYL -1,7, 7-TRI-METHYL -BICYCLO 2.2 .1 HEPTANE AND THEIR PHARMACEUTICAL ACCEPTABLE ACID ADDITION SALTS

摘要

The invention relates to a process for preparing (1R,2S,4R)-(-)-2-Ä(2'-äN,N-dimethylaminoü-ethoxy)Ü-2--ÄphenylÜ-1,7,7-t ri-ÄmethylÜ-bicycloÄ2.2.1Üheptane and pharmaceutically acceptable acid addition salts thereof with higher yields and higher grades of purity.