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
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。
Substrate‐Dependent Electrochemical Dimethoxylation of Olefins
A general and direct electrochemicaldimethoxylation of olefins is reported, which enables a divergent route to different products depending on the structure of olefins. The present protocol features mild conditions and broad substrate scope (49 examples) obviating the usage of transtion‐metals and external oxidants. More importantly, to rationalize the divergent route of the transformation, an ionic‐like
Hydriodic Acid-Mediated Cyclization of α-Substituted Secondary 2-Ethenylbenzamides: Synthesis of 2-Substituted 2,3-Dihydro-3,3-dimethyl-1H-isoindol-1-ones and 3,3-Disubstituted (E)-1-(Arylimino)-1,3-dihydroisobenzofurans
for the preparation of 2‐substituted 2,3‐dihydro‐3,3‐dimethyl‐1H‐isoindol‐1‐ones 3 and 3,3‐disubstituted (E)‐1‐(arylimino)‐1,3‐dihydroisobenzofurans 6 has been developed. Thus, treatment of N‐alkyl(or aryl)‐2‐(1‐methylethen‐1‐yl)benzamides 2 with concentrated hydriodic acid (HI) in MeCN at room temperature afforded 3. Similar treatment of N‐aryl‐2‐(1‐phenylethen‐1‐yl)benzamide 5 with concentrated HI
Study on the ArI-catalyzed intramolecular <i>oxy</i>-cyclization of 2-alkenylbenzamides to benzoiminolactones
作者:Huixia Liu、Xiaojun Deng、Xie Huang、Nan Ji、Wei He
DOI:10.1039/d0ob00612b
日期:——
A metal-free synthetic method toward the preparation of benzoiminolactones through oxy-cyclization of 2-alkenylbenzamides mediated by a catalyst/oxidant (ArI/mCPBA) system was developed.