Enantioselective synthesis of β-amino acids based on BINAP—ruthenium(II) catalyzed hydrogenation
摘要:
BINAP-Ru(II) catalyzed hydrogenation of beta-substituted (E)-beta-(acylamino)acrylic acids allows efficient enantioselective synthesis of beta-amino acids. The Z double bond isomers which possess an intramolecular hydrogen bond between amide and ester groups are more reactive but are hydrogenated with poor enantioselectivity. BINAP-Rh(I) complexes afford only moderate stereoselectivity with the opposite sense of enantioselection.
探索了在辛可尼定改性的Pd / Al 2 O 3催化剂上(Z)-β-脱氢氨基酸的对映选择性氢化。通过使用(Z)-β-脱氢氨基酸和酯进行的比较研究表明,脱氢氨基酸中的羧基对于获得对映选择性至关重要(芳基取代的33%,烷基取代的β-脱氢氨基酸46%)。该结果扩展了手性改性的Pd催化剂上α,β-不饱和羧酸的对映选择性氢化的范围,为合成旋光性β-氨基酸提供了一种新方法。
C1-symmetric bisphosphine ligands and their use in the asymmetric synthesis of pregabalin
申请人:Bao Jian
公开号:US20050228190A1
公开(公告)日:2005-10-13
Materials and methods for preparing (S)-(+)-3-(aminomethyl)-5-methyl-hexanoic acid and structurally related compounds via enantioselective hydrogenation of prochiral olefins are disclosed. The methods employ novel chiral catalysts, which include C
1
-symmetric bisphosphine ligands bound to transition metals.
[EN] BICYCLIC PYRIMIDONE COMPOUNDS AS INHIBITORS OF LP-PLA2<br/>[FR] COMPOSÉS DE PYRIMIDONE BICYCLIQUES UTILISÉS EN TANT QU'INHIBITEURS DE LP-PLA2
申请人:GLAXOSMITHKLINE IP DEV LTD
公开号:WO2014114249A1
公开(公告)日:2014-07-31
The present invention relates to novel pyrimido[1,6-a]pyrimidin-6(2H)-one compounds that inhibit Lp-PLA2 activity, processes for their preparation, to compositions containing them and to their use in the treatment of diseases associated with the activity of Lp-PLA2, for example atherosclerosis, Alzheimer's disease.
in four steps. These newligands were screened in the rhodium‐catalyzed enantioselective hydrogenation of prochiral dehydroamino esters and enamides. Several members of the library showed excellent enantioselectivity with methyl 2‐acetamido acrylate (6 ligands gave >97 % ee), methyl (Z)‐2‐acetamido cinnamate (6 ligands gave >94 % ee), and N‐(1‐phenylvinyl)acetamide (9 ligands gave >95 % ee), whilst
Combinatorial Strategies to find New Catalysts for Asymmetric Hydrogenation Based on the Versatile Coordination Chemistry of METAMORPhos Ligands
作者:Frédéric G. Terrade、Alexander M. Kluwer、Remko J. Detz、Zohar Abiri、Alida M. van der Burg、Joost N. H. Reek
DOI:10.1002/cctc.201500621
日期:2015.10
both the anionic and neutral ligands have the same chirality. If the neutral ligand and the anionicligand have the opposite chirality at the P atom, monometallic and bimetallic heterocomplexes were detected by NMR spectroscopy and MS. For the majority of substrates evaluated in this study, higher enantioselectivities were obtained if the complexes used were based on the heterocombination of an anionic
The rhodium-catalyzedasymmetrichydrogenation of various β-dehydroamino acid derivatives to give optically active β-amino acids has been examined. Chiral monodentate 4,5-dihydro-3H-dinaphthophosphepines, which are easily tuned and accessible in a multi-10-g scale, have been used as ligands. The enantioselectivity is largely dependent on the nature of the substituent at the phosphorous atom and on