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.
complexes were highly efficient catalysts for asymmetrichydrogenation of β-aryl-substituted β-(acylamino)acrylates and β-aryl-substituted β-keto esters. The Ru-bisphosphinite catalysts can tolerate an E/Z mixture of β-aryl-substituted β-(acylamino)acrylates. These highly enantioselective hydrogenations provide a useful way to prepare β-aryl-substituted β-amino acids and β-hydroxyl acids.
Nickel-Catalyzed Asymmetric Transfer Hydrogenation of Olefins for the Synthesis of α- and β-Amino Acids
作者:Peng Yang、Haiyan Xu、Jianrong Steve Zhou
DOI:10.1002/anie.201407744
日期:2014.11.3
The field of asymmetric (transfer) hydrogenation of prochiral olefins has been dominated by noble metal catalysts based on rhodium, ruthenium, and iridium. Herein we report that a simple nickel catalyst is highly active in the transfer hydrogenation using formic acid. Chiral α‐ and β‐amino acid derivatives were obtained in good to excellent enantioselectivity. The key toward success was the use of