Formation of Chiral Allylic Ethers via an Enantioselective Palladium-Catalyzed Alkenylation of Acyclic Enol Ethers
作者:Harshkumar H. Patel、Matthew B. Prater、Scott O. Squire、Matthew S. Sigman
DOI:10.1021/jacs.8b02751
日期:2018.5.9
palladium-catalyzed process to access highly functionalized, optically active allylic aryl ethers. A number of electron-deficient alkenyl triflates underwent enantioselective and site-selective coupling with acyclic aryl enol ethers in the presence of a chiral palladium catalyst. This transform provides chiral allylicether products in high yields and excellent enantiomeric ratios, furnishing a unique
I(III)-Catalyzed Oxidative Cyclization–Migration Tandem Reactions of Unactivated Anilines
作者:Tianning Deng、Emily Shi、Elana Thomas、Tom G. Driver
DOI:10.1021/acs.orglett.0c03497
日期:2020.11.20
An I(III)-catalyzed oxidative cyclization–migration tandem reaction using Selectfluor as the oxidant was developed that converts unactivated anilines into 3H-indoles is reported herein. The reaction requires as little as 1 mol % of the iodocatalyst and is mild, tolerating pyridine and thiophene functional groups, and the dependence of the diastereoselectivity of the process on the identity of the iodoarene
作者:Anais Jolit、Cody F. Dickinson、Kei Kitamura、Patrick M. Walleser、Glenn P. A. Yap、Marcus A. Tius
DOI:10.1002/ejoc.201701117
日期:2017.11.2
The detailed account of an asymmetric Nazarovcyclization that leads to α-hydroxycyclopentenones bearing either vicinal, all-carbon atom quaternary centers, or vicinalquaternary and tertiary centers is described. The all-aliphatic examples represent the greatest challenge as the dienone starting materials are not activated toward cyclization by an aryl group. The rational design and optimization of
Synthesis of Isocoumarins and α-Pyrones via Palladium-Catalyzed Annulation of Internal Alkynes
作者:Richard C. Larock、Mark J. Doty、Xiaojun Han
DOI:10.1021/jo9821628
日期:1999.11.1
factors. A number of 3,4-disubstituted isocoumarins and polysubstituted alpha-pyrones have been prepared in good yields by treating halogen- or triflate-containing aromatic and alpha,beta-unsaturated esters, respectively, with internalalkynes in the presence of a palladium catalyst. Synthetically, the methodology provides an especially simple and convenient regioselective route to isocoumarins and alpha-pyrones
Controlling the Selectivity Patterns of Au-Catalyzed Cyclization–Migration Reactions
作者:Mo Chen、Naijing Su、Tianning Deng、Donald J. Wink、Yingwei Zhao、Tom G. Driver
DOI:10.1021/acs.orglett.8b03888
日期:2019.3.15
2-dihydronaphthalenes. Our data suggests that this transformation occurs via a gold-stabilized cyclopropyl carbinyl cation, which triggers either a [1,2] carboxylate shift or a less favorable [1,2] aryl shift. The relative rates of these migrations can be controlled by the identity of the ligand or by stabilizing the mesomeric cation.