[EN] PROCESSES FOR PREPARING RIVASTIGMINE, SALTS AND INTERMEDIATES THEREOF [FR] PROCÉDÉS DE PRÉPARATION DE RIVASTIGMINE, DE SES SELS ET PRODUITS INTERMÉDIAIRES
A process for the preparation of rivastigmine or a salt thereof
申请人:Dr. Reddy's Laboratories Ltd.
公开号:EP1980552A3
公开(公告)日:2008-10-29
There are provided processes for making rivastigmine. In one embodiment, the process includes reacting S-(-)-[1-(3-hydroxyphenyl)ethyl]dimethylamine with N-ethyl-N-methyl carbamoyl chloride in the presence of an organic base to obtain a free base of rivastigmine.
There are provided processes for making rivastigmine. In one embodiment, the process includes reacting S-(−)-[1-(3-hydroxyphenyl)ethyl]dimethylamine with N-ethyl-N-methyl carbamoyl chloride in the presence of an organic base to obtain a free base of rivastigmine.
An improved and scalable process for the production of rivastigmine tartrate is reported. The improved process provides rivastigmine tartrate at considerably lower cost and allows the omission of hazardous chemicals. The overall yield is increased from 4.66% (reported process) to 17% with the improved process.
[EN] AN IMPROVED PROCESS FOR THE SEPARATION OF ENANTIOMERICALLY PURE COMPOUNDS<br/>[FR] MÉTHODE AMÉLIORÉE DE SÉPARATION DE COMPOSÉS ÉNANTIOMÉRIQUEMENT PURS
申请人:SHODHANA LAB LTD
公开号:WO2009147687A3
公开(公告)日:2011-05-26
Nucleation inhibition in attrition-enhanced Pope-Peachey type of diastereomeric resolutions
作者:Michel Leeman、Bernard Kaptein、Richard M. Kellogg
DOI:10.1016/j.tetasy.2009.05.025
日期:2009.7
The resolution of racemic 1-(3-methoxyphenyl)ethylamine with (S)-mandelic acid by diastereomeric salt formation can be made more economical by application of the Pope-Peachey method. This resolution was further improved upon by the addition of small amounts of a nucleationinhibitor, which prevents the formation of crystals of the more soluble diastereomer. The mandelic acid left in the solution is