The present invention describes a process for producing ezetimibe (EZT) from a protected compound, including a step of deprotecting the 4-(p-hydroxyphenyl) protection group by catalytic hydrogenation, wherein the catalyst is used in an amount of 0.7 wt.-% or lower, relative to the weight of the compound used for the deprotection reaction. After carrying out a step of deprotection reaction, the process preferably comprises: (a) the reaction product is dissolved or extracted in ethyl acetate, and (b) the ethyl acetate solution is washed with an aqueous salt solution. The invention further describes a process for obtaining pure EZT, wherein raw EZT is dissolved in a solvent at a concentration of lower than 0.1 g/ml, and a crystallization step is carried out from this solution. These measures, respectively alone and particularly in combination contribute to attain ezetimibe (EZT) free of critical impurities described herein, and thus to use exceptionally pure ezetimibe (EZT) to be formulated into a pharmaceutical composition together with a pharmaceutically acceptable carrier or excipient.
Raf inhibitor compounds and methods of use thereof
申请人:Miknis Greg
公开号:US20070049603A1
公开(公告)日:2007-03-01
Compounds of Formula I are useful for inhibiting Raf kinase and for treating disorders mediated thereby. Methods of using compounds of Formula I, and stereoisomers, geometric isomers, tautomers, solvates and pharmaceutically acceptable salts thereof, for in vitro, in situ, and in vivo diagnosis, prevention or treatment of such disorders in mammalian cells, or associated pathological conditions are disclosed.
efficiency in modern organic synthesis. In particular, the high potential of biocatalysts still needs to be harvested. Based on an in-depth mechanistic investigation of a new organocatalytic protocol employing two catalysts 1,4-diazabicyclo[2.2.2]octane (DABCO); benzoic acid (BzOH)}, a sequence was established providing starting materials for enzymatic refinement (ene reductase; alcohol dehydrogenase):
Novel processes for the preparation of CGRP-receptor antagonists and intermediates thereof
申请人:Chaturvedula V. Prasad
公开号:US20060122250A1
公开(公告)日:2006-06-08
The invention relates to novel processes for the preparation of small molecule antagonists of calcitonin gene-related peptide receptors (“CGRP-receptor”) and intermediates thereof.
Process for the synthesis of ezetimibe and intermediates useful therefor
申请人:LEK Pharmaceuticals d.d.
公开号:EP2149547A1
公开(公告)日:2010-02-03
The present invention discloses novel and useful intermediates for the synthesis of ezetimibe (EZT), which intermediates share a characteristic Z-isomeric structure. Based on Z-5-(4-fluorophenyl)-pent-4-enoic acid, and proceeding the synthesis through further Z-intermediates, a total synthesis is presented to obtained final ezetimibe in high yields.