Fluorinated Organocatalysts for the Enantioselective Epoxidation of Enals: Molecular Preorganisation by the Fluorine-Iminium Ion Gauche Effect
作者:Eva-Maria Tanzer、Lucie E. Zimmer、W. Bernd Schweizer、Ryan Gilmour
DOI:10.1002/chem.201201316
日期:2012.9.3
The fluorine‐iminium ion gauche effect is triggered upon union of a secondary β‐fluoroamine and an α,β‐unsaturated aldehyde, providing a useful strategy for controlling the molecular topology of intermediates that are central to organocatalytic processes. The β‐fluoroamine (S)‐2‐(fluorodiphenylmethyl)pyrrolidine (1) is an effective catalyst for the enantioselectiveepoxidation of α,β‐unsaturated aldehydes
[EN] NOVEL PROCESS FOR TOTAL SYNTHESIS OF VENLAFAXINE<br/>[FR] NOUVEAU PROCESSUS POUR SYNTHÈSE TOTALE DE LA VENLAFAXINE
申请人:COUNCIL SCIENT IND RES
公开号:WO2015063791A1
公开(公告)日:2015-05-07
There is a need for short, resolution free asymmetric process for synthesis of one isomer of venlafaxine, (-)-venlafaxine. The invention provides a novel, short process of synthesis of (-)-venlafaxine, with yield greater than 50% and ee> 99%. This process can be used for racemic synthesis of venlafaxine with overall yield 65%.
There is a need for short, resolution free asymmetric process for synthesis of one isomer of venlafaxine, (−)-venlafaxine. The invention provides a novel, short process of synthesis of (−)-venlafaxine, with yield greater than 50% and ee>99%. This process can be used for racemic synthesis of venlafaxine with overall yield 65%.