PROCESS FOR PRODUCTION OF MONO-SUBSTITUTED ALKYLATED COMPOUND USING ALDIMINE OR DERIVATIVE THEREOF
申请人:Maruoka Keiji
公开号:US20090054679A1
公开(公告)日:2009-02-26
The present invention provides a method for producing asymmetrical mono-substituted alkylated compounds of α-amino acids that are represented by a specific formula, using an aldimine-type Schiff base. In the method of the present invention, the process of alkylating an aldimine-type Schiff base in a medium in the presence of an optically-active quaternary ammonium salt phase-transfer catalyst and an inorganic base is initiated, and subsequently the reaction is quenched at a time earlier than a time for completion of the stoichiometric reaction of the alkylation reaction, so that a mono-substituted alkylated product with high optical purity can be obtained.
OPTICALLY ACTIVE QUATERNARY AMMONIUM SALT HAVING AXIAL ASYMMETRY AND PROCESS FOR PRODUCING ALPHA-AMINO ACID AND DERIVATIVE THEREOF WITH THE SAME
申请人:Maruoka Keiji
公开号:US20090270614A1
公开(公告)日:2009-10-29
The present invention provides a chiral phase-transfer catalyst of the following formula (I):
The compound (I) can be produced by reacting a 2,2′-dimethylene bromide-1,1′-biphenyl derivative, which can be produced through comparatively small number of steps, with an easily available secondary amine.