The chiral phosphine-containing palladacycle, synthesized easily from H-MOP, showed its high catalytic activity as well as asymmetric induction ability in ring-openingreaction of oxabicyclic alkenes with arylboronic acids, providing corresponding products in high yields and high ee.
Asymmetric Ring-Opening Reactions of Aza- and Oxa-bicyclic Alkenes with Boronic Acids Using a Palladium/Zinc Co-catalytic System
作者:Wei Zhang、Jingchao Chen、Guangzhi Zeng、Fan Yang、Jianbin Xu、Weiqing Sun、Madhuri Vikas Shinde、Baomin Fan
DOI:10.1021/acs.joc.6b03038
日期:2017.3.3
The asymmetric ring opening reactions of bicyclic alkenes with boronic acids were accomplished by using a highly active palladium/zinc co-catalytic system that was suitable for both azabenzonorbornadienes and oxabenzonorbornadienes, which were transformed to the corresponding chiral hydronaphthalene products in high yields (up to 99%) and high optical purities (up to 98% ee). The reaction protocol
Water‐Promoted Palladium‐Catalyzed Asymmetric Ring‐Opening of Oxabenzonorbornadienes with Alkoxysilanes
作者:Yun Tan、Yongqi Yao、Wen Yang、Qifu Lin、Guobao Huang、Minxiong Tan、Shuqi Chen、Donghan Chen、Dingqiao Yang
DOI:10.1002/adsc.201901152
日期:2020.1.7
Water‐promoted palladium‐catalyzed asymmetric ring‐opening (ARO) reaction of oxabenzonorbornadienes with a wide variety of alkoxysilanes has been developed in a one‐pot fashion, yielding cis‐1,2‐dihydronaphthalen‐1‐ols in favourable yields (up to 98%) with gratifying enantioselectivities (up to 98% ee) under mild conditions. To the best of our knowledge, it represents the first example in the ring‐opening
Chiral Palladacycle Catalysts Generated on a Single-Handed Helical Polymer Skeleton for Asymmetric Arylative Ring Opening of 1,4-Epoxy-1,4-dihydronaphthalene
作者:Takeshi Yamamoto、Yuto Akai、Michinori Suginome
DOI:10.1002/anie.201407358
日期:2014.11.17
Post‐polymerization CH activation of poly(quinoxaline‐2,3‐diyl)‐based helically chiral phosphine ligands (PQXphos) with palladium(II) acetate afforded chiral phosphapalladacycles quantitatively. In situ generated palladacycles exhibited enantioselectivities up to 94 % ee in the palladium‐catalyzed asymmetric ring‐opening arylation of 1,4‐epoxy‐1,4‐dihydronaphthalenes with arylboronic acids.