Palladium-Catalyzed <i>syn</i>-Stereocontrolled Ring Opening of Oxabicyclic Alkenes with Arylsulfonyl Hydrazides
作者:Donghan Chen、Yongqi Yao、Wen Yang、Qifu Lin、Huanyong Li、Lin Wang、Shuqi Chen、Yun Tan、Dingqiao Yang
DOI:10.1021/acs.joc.9b01957
日期:2019.10.4
A novel palladium-catalyzed ring-opening reaction of oxabicyclic alkenes with arylsulfonylhydrazides was first developed. In this work, we provide an efficient one-pot reaction to afford the corresponding cis-2-aryl-1,2-dihydronaphthalen-1-ols and 2-aryl-naphthalenes in moderate to excellent yields (up to 95%) under an open-air condition. Various types of functional groups attached to the substrates
Palladium-Catalyzed <i>syn</i>-Stereocontrolled Ring-Opening of Oxabicyclic Alkenes with Sodium Arylsulfinates
作者:Yue Li、Wen Yang、Guo Cheng、Dingqiao Yang
DOI:10.1021/acs.joc.6b00667
日期:2016.6.3
Palladium-catalyzed syn-stereocontrolled ring-opening reactions of oxabenzonorbornadienes with a wide range of sodium arylsulfinates were investigated, affording the desired products in good to excellent yields under an air atmosphere. This protocol provides a low-cost new viable and convenient method toward the synthesis of cis-2-aryl-1,2-dihydronaphthalen-1-ol with good functional group tolerance
A one-potsynthesis of the chiral dihydrobenzofuran framework is described. The method utilizes Rh-catalyzed asymmetric ring opening (ARO) and Pd-catalyzed C–O coupling to furnish the product in excellent enantioselectivity without isolation of intermediates. Systematic metal–ligand studies were carried out to investigate the compatibility of each catalytic system using product enantiopurity as an
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.
Platinum(II)-Catalyzed Asymmetric Ring-Opening Addition of Arylboronic Acids to Oxabenzonorbornadienes
作者:Xuejing Pan、Guobao Huang、Yuhua Long、Xiongjun Zuo、Xuan Xu、Fenglong Gu、Dingqiao Yang
DOI:10.1021/jo402386k
日期:2014.1.3
A new platinum(II)-catalyzed asymmetric ring-opening addition of arylboronic acids to oxabenzonorbornadienes was developed, which afforded the corresponding cis-2-aryl-1,2-dihydronaphthalen-1-ol products in high yields (up to 97%) with moderate to good enantioselectivities (up to 89% ee) under very mild conditions. The effects of various ligands, catalyst loading, bases, solvents, and temperatures on the yield and enantioselectivity of the reaction were also investigated. The cis configuration of product 2m was confirmed by X-ray diffraction analysis. A potential mechanism for the present catalytic reaction is proposed.