Chiral Mandelic Acid Template Provides a Highly Practical Solution for (<i>S</i>)-Oxybutynin Synthesis
作者:Paul T. Grover、Nandkumar N. Bhongle、Stephen A. Wald、Chris H. Senanayake
DOI:10.1021/jo005562f
日期:2000.9.1
STEREOSELECTIVE PROCESS FOR PREPARING (CYCLO)ALKYL PHENYLGLYCOLIC ACIDS
申请人:Sepracor Inc.
公开号:EP1127043A1
公开(公告)日:2001-08-29
US6180823B1
申请人:——
公开号:US6180823B1
公开(公告)日:2001-01-30
US6376684B1
申请人:——
公开号:US6376684B1
公开(公告)日:2002-04-23
[EN] STEREOSELECTIVE PROCESS FOR PREPARING (CYCLO)ALKYL PHENYLGLYCOLIC ACIDS<br/>[FR] PROCEDE STEREOSELECTIF DE PREPARATION D'ACIDES (CYCLO)ALKYLPHENYLGLYCOLIQUES
申请人:SEPRACOR INC
公开号:WO2000027786A1
公开(公告)日:2000-05-18
A process for preparing an alkyl phenylglycolic acid is disclosed. It follows the sequence of condensing a substituted acetaldehyde with mandelic acid to provide a 5-phenyl-1,3-dioxolan-4-one, which is condensed with an alkyl ketone or aldehyde to provide a 5-(1-hydroxyalkyl)-5-phenyl-1,3-dioxolan-4-one, which is dehydrated to a 5-(1-alkenyl)-5-phenyl-1,3-dioxolan-4-one. The 5-(1-alkenyl)-5-phenyl-1,3-dioxolan-4-one may be hydrolyzed and reduced to an α-alkylphenylglycolic acid or the hydrolysis and reduction steps may be reversed. The process enables the production of single enantiomers of cyclohexylphenylglycolic acid (CHPGA). An analogous process for racemic CHPGA is disclosed employing racemic mandelic acid and acetone. Novel intermediates in the process are also disclosed.