Anodic Oxidation and Organocatalysis: Direct Regio- and Stereoselective Access to meta-Substituted Anilines by α-Arylation of Aldehydes
作者:Kim L. Jensen、Patrick T. Franke、Lasse T. Nielsen、Kim Daasbjerg、Karl Anker Jørgensen
DOI:10.1002/anie.200904754
日期:2010.1.4
What's the potential? An anodic oxidation/organocatalytic α‐arylation of aldehydes using substituted electron‐rich aromatic compounds has been developed. The method gives access to meta‐substituted anilines and dihydrobenzofurans in good yields and excellent enantioselectivity (see scheme; Pg=protecting group). This method is an example of a new concept combining organocatalysis with electrochemistry
Chiral Primary Amine Catalyzed
<i>α</i>
‐Arylation of Simple Ketones via Asymmetric Retro‐Claisen Cleavage
作者:Yanfang Han、Mingying Shi、Xueling Mi、Sanzhong Luo
DOI:10.1002/chem.202202584
日期:2022.12.20
C−C cleavage to arylation. Enantioselective α-arylation of simple aliphatic ketones has been achieved via chiral primary amine catalyzed asymmetric retro-Claisen cleavage involving β-diketones and para-quinone monoimines that facilitates the construction of α-aryl tertiary carbon stereocenters in good yields and high enantioselectivities.
A gold-catalyzed oxidative three-component reaction of terminal alkynes with alcohols and quinone monoimines has been disclosed, affording α-ketoacetals in good to excellent yields. By using quinone monoimines as electrophiles for the interception of the in situ generated gold enolate intermediate, this one-pot process provides an unprecedented method for the polyfunctionalization of terminal alkynes
A strategy allowing the switchable divergent synthesis of chiral indolederivatives was established via chiral phosphoric acid-catalyzed asymmetric dearomatization of 2,3-disubstituted indoles using naphthoquinone monoimines as electrophiles. The products were switched between chiral indolenines and fused indolines according to the post-processing conditions. Both two types of products were obtained