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.
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
Homogeneous Palladium-Catalyzed Selective Reduction of 2,2′-Biphenols Using HCO2H as Hydrogen Source
作者:Wen Yang、Wanxiang Zhao、Ruoling Li、Chenchen Li
DOI:10.1055/a-1337-5153
日期:2021.5
efficient homogeneous palladium-catalyzed selective deoxygenation of 2,2′-biphenols by reduction of aryl triflates with HCO2H as the hydrogensource is reported. This protocol complements the current method based on heterogeneous Pd/C-catalyzed hydrogenation with hydrogen gas. This process provided the reduction products in good to excellent yields, which could be readily converted to various synthetically
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.