Intramolecular Hydroamidation of <i>ortho</i>
-Vinyl Benzamides Promoted by Potassium <i>tert</i>
-Butoxide/<i>N,N</i>
-Dimethylformamide
作者:Zhen-yu Chen、Liang-yu Wu、Hai-sheng Fang、Ting Zhang、Zhi-feng Mao、Yong Zou、Xue-jing Zhang、Ming Yan
DOI:10.1002/adsc.201700369
日期:2017.11.23
An intramolecular hydroamidation of ortho-vinyl benzamides had been developed. The reaction was promoted efficiently by potassiumtert-butoxide and N,N-dimethylformamide without the need for strong oxidants or transition-metal catalysts. A series of dihydroisoquinolinones and 3-benzylisoindolinones were prepared in good to excellent yields. The new method is operationally simple, scalable, and tolerant
chemistry is reported. Both phenol and aromatic or aliphatic acid derivatives could be used under operator-friendly conditions (room temperature, technical solvents, under air). The discovery of the superiority of benziodoxolone-derived hypervalent iodine reagent 3d as an alkyne transfer reagent further expands the rapidly increasing utility of hypervalent iodine reagents in catalysis and is expected
Enantioselective Palladium(II)-Catalyzed Intramolecular Aminoarylation of Alkenes by Dual N−H and Aryl C−H Bond Cleavage
作者:Wen Zhang、Pinhong Chen、Guosheng Liu
DOI:10.1002/anie.201700889
日期:2017.5.2
An asymmetric palladium‐catalyzed intramolecular oxidative aminoarylation of alkenes has been developed with quinoline–oxazoline chiral ligands and Ag2CO3 as the oxidant. Various indolines containing a quaternary stereogenic center were synthesized in high yield with excellent enantioselectivity. Preliminary mechanistic studies suggest that the addition of a catalytic amount of phenylglyoxylic acid
用喹啉-恶唑啉手性配体和Ag 2 CO 3作为氧化剂,开发了不对称钯催化的烯烃分子内氧化氨基芳基化反应。含有四元立体异构中心的各种二氢吲哚以高产率合成,具有出色的对映选择性。初步的机理研究表明,加入催化量的苯乙醛酸可显着加快反应速度,并略微提高对映选择性。
Copper-Catalyzed Modular Amino Oxygenation of Alkenes: Access to Diverse 1,2-Amino Oxygen-Containing Skeletons
作者:Brett N. Hemric、Andy W. Chen、Qiu Wang
DOI:10.1021/acs.joc.8b02885
日期:2019.2.1
Copper-catalyzed alkeneamino oxygenation reactions using O-acylhydroxylamines have been achieved for a rapid and modular access to diverse 1,2-amino oxygen-containing molecules. This transformation is applicable to the use of alcohols, carbonyls, oximes, and thio-carboxylic acids as nucleophiles on both terminal and internal alkenes. Mild reaction conditions tolerate a wide range of functional groups
Copper-Mediated/Catalyzed Oxyalkylation of Alkenes with Alkylnitriles
作者:Ala Bunescu、Qian Wang、Jieping Zhu
DOI:10.1002/chem.201405102
日期:2014.11.3
A copper‐promoted oxyalkylation of alkenes with alkylnitriles has been developed. The protocol provides rapid access to phthalides (γ‐lactones) or isochromanones (δ‐lactones) via the formation of a C(sp3)C(sp3) and a C(sp3)O bond with the generation of up to two quaternary carbon atoms. Mechanistic studies suggest that this reaction is initiated by the formation of the C(sp3)C(sp3) bond rather than