Process for the preparation of piperidinylaminomethyl trifluoromethyl cyclic ether compounds
申请人:Pfizer Inc
公开号:US06486325B1
公开(公告)日:2002-11-26
The present invention relates to a novel process for the preparation of a diastereomeric mixture of piperidinylaminomethyl trifluoromethyl cyclic ether compounds of formulae Ia and Ib:
and pharmaceutically acceptable salts thereof, wherein R1 is C1-C6 alkyl; R2 is C1-C6 alkyl, halo C1-C6 alkyl or phenyl or substituted phenyl; R3 is hydrogen or halo; m is zero, one or two, and wherein said mixture is highly enriched in the compound of formula Ia, and to novel processes for the preparation and purification of intermediate compounds useful in the preparation of compounds of formulae Ia and Ib.
The identification and development of a catalyst for the enantioselective nucleophilic addition of a trifluoromethyl anion to a ketone is described. An easily prepared cinchonine-derived catalyst was used in amounts as low as 4 mol% to afford enantiomeric excess as high as 92%.
The invention provides compounds of formula VI
1
and the pharmaceutically acceptable salts thereof, wherein R1, R2, R3, and R4 are as defined, to pharmaceutical compositions containing such compounds and to the use of such compounds in the treatment and prevention of central nervous system and other disorders. The invention also provides methods for inhibiting neurological damage caused by impairment of glucose and/or oxygen to the brain in a mammal, which method comprises administering to the mammal a NOS inhibitor. In one embodiment, the NOS inhibitor is administered to the mammal prior to surgery, for example prior to cardiac surgery, angioplasty, or angiography.
Process Research and Development of an NK-1 Receptor Antagonist. Enantioselective Trifluoromethyl Addition to a Ketone in the Preparation of a Chiral Isochroman
作者:Stéphane Caron、Nga M. Do、Janice E. Sieser、Patrice Arpin、Enrique Vazquez
DOI:10.1021/op7001886
日期:2007.11.1
CJ-17,493 (4) is a chiral NK-1 receptor antagonist. It was first prepared through a diastereoselective crystallization, then through chiral chromatography of a key intermediate, and ultimately via asymmetricsynthesis. Multiple routes for the preparation of a key isochroman were demonstrated, and conditions for improved regioselectivity of a Friedel–Crafts acylation were identified. Cesium fluoride