Diastereoselective Synthesis of 2,3-cis-Alkyl-3-oxygenated Piperidine Derivatives by Titanium Mediated Intramolecular Cyclization of a-Aminoacetal-allylsilane System
Diastereoselective Synthesis of 2,3-cis-Alkyl-3-oxygenated Piperidine Derivatives by Titanium Mediated Intramolecular Cyclization of a-Aminoacetal-allylsilane System
The first successful resolution of rac-α-aminoacetals via diastereoisomeric salt formation with optically pure N-protected aminoacids is reported. The absolute configuration assignment of α-aminoacetal enantiomers is performed by an entirely non-racemizing chemical correlation method involving N-protection and a new efficient hydrolysis step followed by a reduction of the resulting N-protected α-aminoaldehyde
[EN] PROCESS OF PREPARATION OF OPTICALLY ACTIVE ALPHA AMINOACETALS<br/>[FR] PRÉPARATION D'ALPHA AMINOCÉTALS OPTIQUEMENT ACTIFS
申请人:CLARIANT SPECIALTY FINE CHEM
公开号:WO2009106386A1
公开(公告)日:2009-09-03
The invention relates to a process for preparing optically active α-aminoacetals by resolution of a racemic mixture or of a mixture of enantiomers via the formation of diastereoisomeric salts, and also novel intermediates in the form of diastereoisomeric salts.
PROCESS OF PREPARATION OF OPTICALLY ACTIVE ALPHA AMINOACETALS
申请人:Clariant Specialty Fine Chemicals (France)
公开号:EP2245000B1
公开(公告)日:2013-01-02
Diastereoselective Synthesis of 2,3-cis-Alkyl-3-oxygenated Piperidine Derivatives by Titanium Mediated Intramolecular Cyclization of a-Aminoacetal-allylsilane System