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.
[EN] STEREOSELECTIVE SYNTHESIS OF HIGHLY SUBSTITUTED ENAMIDES<br/>[FR] SYSNTHÈSE STÉRÉOSÉLECTIVE D'ÉNAMIDES À FORTE SUBSTITUTION
申请人:UNIV NANYANG TECH
公开号:WO2012173572A1
公开(公告)日:2012-12-20
The disclosure provides new methods for the oxidative Heck cross-coupling reaction with electron-rich alkenes such as substituted β-amidoacrylate and other related substituted enamides. Previously, functionalization of enamides under Heck conditions has been limited to those with unsubstituted vinyl groups. By tuning the reaction parameters that allow for the balance between stability and reactivity of the reactants, the oxidative Heck cross-coupling reaction now provides highly substituted enamides in good to excellent yields. (II) (III) (I)·
Arylations of Substituted Enamides by Aryl Iodides: Regio- and Stereoselective Synthesis of (<i>Z</i>)-β-Amido-β-Arylacrylates
作者:Quan Gou、Bin Deng、Hongbin Zhang、Jun Qin
DOI:10.1021/ol402215f
日期:2013.9.6
Arylations of substituted enamides by aryl iodides were achieved for the first time via an unusual PdCl2(COD)/Ag3PO4 catalytic system. A broad range of (Z)-β-amido-β-arylacrylates were prepared regio- and stereoselectively in a highly efficient manner.
经由不寻常的PdCl 2(COD)/ Ag 3 PO 4催化系统,首次实现了芳基碘取代的酰胺的芳基化。以高效方式在区域和立体选择性上制备了多种(Z)-β-酰胺基-β-芳基丙烯酸酯。
[EN] E-ISOMERIC beta-AROMATIC OR HETEROAROMATIC SUBSTITUTED beta-ACYLAMINO-ACRYLATES AND METHODS OF PREPARING THE SAME<br/>[FR] DOLLAR G(B)-ACYLAMINO-ACRYLATES E-ISOMERES A SUBSTITUTION DOLLAR G(B)-AROMATIQUE OU HETEROAROMATIQUE ET LEUR PROCEDES DE PREPARATION
申请人:DSM IP ASSETS BV
公开号:WO2004011414A1
公开(公告)日:2004-02-05
E-isomeric ß-(hetero) aromatically substituted acylaminoacrylates are of great economic interest since with them, by means of hydration, precursors of appropriately substituted (ß-amino acids can be prepared and, by doing so, lead to higher enantio-selectivities than the corresponding Z-isomers. The invention describes novel E-isomeric R-aromatically or ß-heteroaromatically substituted ß-acylaminoacrylates of the general formula (I): in which R represents hydrogen or a substituted or unsubstituted alkyl or aromatic or heteroaromatic residue, and R' represents a substituted or unsubstituted aromatic or heteroaromatic residue, R' represents H, a substituted or unsubstituted alkyl or aromatic or heteroaromatic residue, and R'' represents H, a substituted or unsubstituted alkyl, acyl, aromatic or heteroaromatic residue. According to the invention, the compounds according to the general formula (I) are prepared by acylation at temperatures below the boiling point of the reaction mixture.
asymmetric hydrogenation of 13 different β-dehydroaminoacid derivatives to give optically active β-amino acidesters has been examined. Readily accessible monodentate octahydrobinaphthol-based phosphoramidites were used as chiral ligands. Good to excellent enantioselectivities and yields were obtained for the E isomers, whereas poorer catalyst performance was found for the Z isomers. Importantly, to obtain
Synthesis of a New Chiral Bisphospholane Ligand for the Rh(I)-Catalyzed Enantioselective Hydrogenation of Isomeric β-Acylamido Acrylates
作者:Jens Holz、Axel Monsees、Haijun Jiao、Jinsong You、Igor V. Komarov、Christine Fischer、Karlheinz Drauz、Armin Börner
DOI:10.1021/jo020453h
日期:2003.3.1
The highly stereoselective synthesis of a chiral silylphospholane has been described, which can be advantageously used as a building block under base-free conditions for the construction of diphosphines related to DuPHOS. The utility of silylphospholane is shown in the synthesis of a new bisphospholane ligand 1 (MalPHOS), which is characterized by a maleic anhydride backbone. The ligand forms with