The present invention provides an improved process for the preparation of Dolasetron salts, in particularly Dolasetron mesylate. Also provided are intermediates for the process and methods of preparing the intermediates. Intermediates for preparing Dolasetron according to the invention include 7-alkoxycarbonyl-9-(alkoxycarbonylmethyl)-3-trialkylsilyloxy-9-azabicyclo[3.3.1]nonane compounds (SAN compounds) and endo-9-alkoxycarbonyl-5-trialkylsilyloxy-8-azatricyclo[5.3.1.0
3,8
]undecan-10-one compounds (SQO compounds).
本发明提供了一种改进的多拉塞特龙盐制备工艺,特别是多拉塞特龙
甲磺酸盐的制备工艺。还提供了该工艺的中间体和制备中间体的方法。根据本发明制备多拉塞特龙的中间体包括7-烷氧羰基-9-(烷氧羰基甲基)-3-三烷基
硅氧基-
9-氮杂双环[3.3.1]壬烷化合物(
SAN化合物)和内-9-烷氧羰基-5-三烷基
硅氧基-8-氮杂
三环[5.3.1.0^3,8]
十一烷-10-酮化合物(SQO化合物)。