Catalytic dehydrogenative dual functionalization of ethers: dealkylation–oxidation–bromination accompanied by C–O bond cleavage via aerobic oxidation of bromide
A catalytic dehydrogenative dual functionalization (DDF) of ethers viaoxidation, dealkylation, and α-bromination by the aerobic oxidation of bromide was developed to obtain the corresponding α-bromo ketones in high yields. In particular, the reaction of substituted tetrahydrofurans as cyclic ethers provided 3,3-dibromo tetrahydrofuran-2-ols in high yields selectively through the double α-bromination
Direct Functionalization of Tetrahydrofuran and 1,4-Dioxane: Nickel-Catalyzed Oxidative C(sp<sup>3</sup>)H Arylation
作者:Dong Liu、Chao Liu、Heng Li、Aiwen Lei
DOI:10.1002/anie.201300459
日期:2013.4.15
nickel: The nickel‐catalyzed oxidativearylation of C(sp3)H bonds has been achieved. Several substituted arylboronic acids and various C(sp3)H bonds were found to be suitable substrates for this novel transformation, which is likely to proceed through a radical pathway. This method allows the introduction of simple ether derivatives to construct α‐arylated ethers. FG=functional group.
New 2,5-diaryl tetrahydrofurans and analogs thereof as paf antagonists
申请人:Merck & Co., Inc.
公开号:EP0322033A2
公开(公告)日:1989-06-28
A class of 2,5-diaryl tetrahydrofuran derivatives are PAF antagonists and are therefore useful in the treatment of various diseases including prevention of platelet aggregation, hypotension, inflammation, asthma, lung edema, adult respiratory distress syndrome, various shock syndromes, cardiovascular disorders and other related skeletal-muscular disorders.
Site- and Enantiodifferentiating C(sp<sup>3</sup>)–H Oxidation Enables Asymmetric Access to Structurally and Stereochemically Diverse Saturated Cyclic Ethers
作者:Shutao Sun、Yiying Yang、Ran Zhao、Dongju Zhang、Lei Liu
DOI:10.1021/jacs.0c09636
日期:2020.11.11
A manganese-catalyzed site- and enantiodifferentiating oxidation of C(sp3)-H bonds in saturated cyclic ethers has been described. The mild and practical method is applicable to a range of tetrahydrofurans, tetrahydropyrans, and medium-sized cyclic ethers with multiple stereocenters and diverse substituent patterns in high efficiency with extremely efficient site- and enantiodiscrimination. Late-stage
Palladium nanoparticles: Chemoselective control for reductive Heck with aryl triflates and 2,3-dihydrofuran
作者:Daisy Rosas Vargas、Silas P. Cook
DOI:10.1016/j.tet.2018.04.052
日期:2018.6
Consequently, further development of new variants would be transformative. Unfortunately, controlling the relative rates of the organopalladium intermediates has proven difficult with homogenous, single-site Pd catalysts. This work describes a selective reductive Heck reaction catalyzed by Pd-nanoparticles. The reaction works well with electron-deficient aryl triflates at room temperature in the absence