Stereoselective Access to 1-[2-Bromo(het)aryloxy]propan-2-amines Using Transaminases and Lipases; Development of a Chemoenzymatic Strategy Toward a Levofloxacin Precursor
(91–99% ee) depending on the transaminase source. In a complementary approach, the classical kinetic resolutions of the racemicamines have been investigated using Candida antarctica lipase type B as biocatalyst. Ethyl methoxyacetate was found as a suitable acyl donor leading to the corresponding (S)-amines (90–99% ee) and (R)-amides (88–99% ee) with high selectivity in most of the cases. A preparative
METHOD FOR PRODUCING OPTICALLY ACTIVE COMPOUND, AND NOVEL METAL-DIAMINE COMPLEX
申请人:TAKASAGO INTERNATIONAL CORPORATION
公开号:US20160347678A1
公开(公告)日:2016-12-01
The present invention pertains to a method for producing an optically active compound which includes a step for reducing an imino group of an imine compound or a step for reducing an unsaturated bond of a heterocyclic compound, while in the presence of hydrogen gas as a hydrogen donor and one or more types of complexes selected from a group consisting of a complex represented by general formula (1), a complex represented by general formula (2), a complex represented by general formula (3), and a complex represented by general formula (4) (the general formulas (1)-(4) are as stipulated by claim
1
).
Diastereoselective Acylation of Racemic Heterocyclic Amines with N-Tosyl-(S)-Prolyl Chloride and its Structural Analogs
作者:S. A. Vakarov、D. A. Gruzdev、E. N. Chulakov、L. Sh. Sadretdinova、M. A. Ezhikova、M. I. Kodess、G. L. Levit、V. P. Krasnov
DOI:10.1007/s10593-014-1538-8
日期:2014.9
resolution of racemic amines (2,3-dihydro-4H-1,4-benzoxazine and 1,2,3,4-tetrahydroquinoline derivatives) via diastereoselective acylation with N-tosyl-(S)-prolyl chloride and its structural analogs was performed. The effect of resolving agent structure on the stereoselectivity of heterocyclicamineacylation was examined. The highest stereoselectivity was achieved in the case of acylation with acyl chlorides
N-Tosyl-(S)-Prolyl Chloride in Kinetic Resolution of Racemic Heterocyclic Amines
作者:D. A. Gruzdev、S. A. Vakarov、G. L. Levit、V. P. Krasnov
DOI:10.1007/s10593-014-1432-4
日期:2014.3
The kinetic resolution of racemic heterocyclicamines via acylation with N-tosyl-(S)-prolyl chloride was systematically investigated. It was established that racemic mixtures of aromatic amines could be resolved with high efficiency, while the acylation of 2- and 3-methylpiperidines occurred with low diastereoselectivity. A method for the preparation of enantiomerically pure (3R)-7,8-difluoro-3-methyl-3
Stereoinversion in the diastereoselective acylation of benzoxazine derivatives with 2-aryloxypropionyl chlorides
作者:S. A. Vakarov、M. A. Korolyova、D. A. Gruzdev、M. G. Pervova、G. L. Levit、V. P. Krasnov
DOI:10.1007/s11172-019-2550-z
日期:2019.6
A comparative study of the kineticresolution of racemic derivatives of 3,4-dihydro-3-methyl-2H-[1,4]benzoxazine using racemic 2-aryloxypropionyl chlorides was performed. It was found that the acylation of racemic amines with racemic2-(1-naphthyloxy)propionyl chloride leads to amides enriched with (3R*,2′R*)-diastereomers, while the acylation with 2-phenoxypropionyl chloride gives predominantly (3R*