Rh(I)-Catalyzed Intermolecular Hydroacylation: Enantioselective Cross-Coupling of Aldehydes and Ketoamides
作者:Kevin G. M. Kou、Diane N. Le、Vy M. Dong
DOI:10.1021/ja504296x
日期:2014.7.2
Under Rh(I) catalysis, alpha-ketoamides undergo intermolecular hydroacylation with aliphatic aldehydes. A newly designed Josiphos ligand enables access to alpha-acyloxyamides with high atom-economy and enantioselectivity. On the basis of mechanistic and kinetic studies, we propose a pathway in which rhodium plays a dual role in activating the aldehyde for cross-coupling. A stereochemical model is provided to rationalize the sense of enantioinduction observed.
AN EFFICIENT SYNTHESIS OF α-KETO AMIDES VIA REACTION OF α-(<i>N</i>-METHYLANILINO)-ACETONITRILE WITH ESTERS FOLLOWED BY HYDROLYSIS USING COPPER (II) ACETATE
An efficient sequence proposed for the conversion of esters to α-keto amides involves the reaction of α-(N-methylanilino)-acetonitrile with esters to afford β-hydroxy-α-cyanoenamines of which hydrolysis using copper (II) acetate gives the corresponding α-keto amides in good yields.
建议将酯转化为 α-酮酰胺的有效序列涉及 α-(N-甲基苯胺基)-乙腈与酯反应得到 β-羟基-α-氰胺,其中使用乙酸铜 (II) 水解得到相应的α-酮酰胺收率良好。
Copper-Catalyzed Synthesis of Azaspirocyclohexadienones from α-Azido-<i>N</i>-arylamides under an Oxygen Atmosphere
作者:Shunsuke Chiba、Line Zhang、Jian-Yuan Lee
DOI:10.1021/ja1027327
日期:2010.6.2
copper-catalyzed reaction of alpha-azido-N-arylamides was found to proceed under an oxygen atmosphere to afford azaspirocyclohexadienones. The present transformation is carried out by a sequence of denitrogenative formation of iminyl copper species from alpha-azido-N-arylamides and their imino-cupration with an intramolecular benzene ring on the amido nitrogen followed by consecutive formation of C=O bonds. The