[EN] PROCESS FOR THE PREPARATION OF 4-(FLUOROPHENYL)PIPERIDINE ESTERS<br/>[FR] PREPARATION D'ESTERS DE 4-(FLUOROPHENYL)PIPERIDINE
申请人:SMITHKLINE BEECHAM PLC
公开号:WO2001029002A1
公开(公告)日:2001-04-26
Firstly a process for the preparation of the (-) trans ester of structure (4), [a valuable intermediate in the preparation of paroxetine] comprising resolution of the corresponding racemic cis ester by the formation of a salt with a chiral acid to give the (+) cis ester, followed by epimerisation of the (+) cis ester with a strong base. Secondly a process for the preparation of a crystalline salt of a racemic trans compound of structure (4) comprising contacting a solution of racemic trans compound of structure (4) with a suitable acidic component, isolating the crystalline product and optionally recrystallising the product. Thirdly a process for the preparation of the (-) trans ester of structure (4) which comprises forming a solution of the product of the process of the second aspect of this invention and a chiral acid, and seeding the solution with a crystalline salt formed from the (-) trans product of the process of the first aspect of this invention and the same chiral acid.