[EN] CHIRAL GUANIDINES, SALTS THEREOF, METHODS OF MAKING CHIRAL GUANIDINES AND SALTS THEREOF, AND USES OF CHIRAL GUANIDINES AND SALTS THEREOF IN THE PREPARATION OF ENANTIOMERICALLY PURE AMINO ACIDS<br/>[FR] GUANIDINES CHIRALES, SELS DE CELLES-CI, PROCÉDÉS DE FABRICATION DE GUANIDINES CHIRALES ET DE LEURS SELS, ET UTILISATIONS DE GUANIDINES CHIRALES ET DE LEURS SELS DANS LA PRÉPARATION D'ACIDES AMINÉS ÉNANTIOMÉRIQUEMENT PURS
申请人:FU RUI
公开号:WO2021081677A1
公开(公告)日:2021-05-06
Provided are compounds and salts having a structure of Formula (I) or (II): (I), and (II) wherein: both of the chiral carbon atoms denoted by "*" are both in the R configuration or both in the S configuration. Compounds and salts of Formulae (I) and (II) are useful in the preparation of enantiomerically pure amino acids. Conversion of amino acids to D-form from any of L-form, racemate or other enantiomerically impure mixtures or conversion of amino acids to L-form from any of D-form, racemate or other enantiomerically impure mixtures is disclosed.
A series of chiral cyclometalated iridiumcomplexes have been synthesised by cyclometalating chiral 2-aryl-oxazoline and imidazoline ligands with [Cp*IrCl2]2. These iridacycles were studied for asymmetric transfer hydrogenation reactions with formic acid as the hydrogen source and were found to display various activities and enantioselectivities, with the most effective ones affording up to 63% ee
We herein report a general, practical, and highly efficient method for asymmetricsynthesis of a wide range of chiral vicinal diamines via reductive coupling of imines templated by chiral diboron. The protocol features high enantioselectivity and stereospecificity, mild reaction conditions, simple operating procedures, use of readily available starting materials, and a broad substrate scope. The method