Process for the preparation of (1R, 2S, 4R) - (-) - 2 (2'-N, N-dimethylamino-ethoxy) -2-phenyl-1,7,7-trimethylbicyclo-2.2.1- heptane and pharmaceutically acceptable acid addition salts thereof

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.