Access to 2-Alkyl/Aryl-4-(1<i>H</i>)-Quinolones via Orthogonal “NH<sub>3</sub>” Insertion into <i>o</i>-Haloaryl Ynones: Total Synthesis of Bioactive Pseudanes, Graveoline, Graveolinine, and Waltherione F
An efficient one-pot synthesis of 4-(1H)-quinolones through an orthogonal engagement of diverse o-haloaryl ynones with ammonia in the presence of Cu(I), involving tandem Michael addition and ArCsp2-N coupling, is presented. The substrate scope of this convenient protocol, wherein ammonium carbonate acts as both an in situ ammonia source and a base toward diverse 2-substituted 4-(1H)-quinolones, has
Synthesis of indoline-fused eight-membered azaheterocycles through Zn-catalyzed dearomatization of indoles and subsequent base-promoted C–C activation
作者:Yuanyang Mu、Yang Yuan、Ye Wang、Murong Xu、Ye Feng、Yulei Zhao、Yanzhong Li
DOI:10.1039/d0ob01626h
日期:——
A cascade reaction for the synthesis of indoline-fused eight-membered azaheterocycles has been developed through the Zn-catalyzed dearomatization of indoles, base-promoted ring-expansion and intramolecular SNAr reaction.
An efficient synthesis of 2,5-disubstitutedfurans directly from alkynyl ketones has been developed via tandem gold(I)-catalyzed isomerization of alkynyl ketones to allenyl ketones and cycloisomerization. The key to the success of this chemistry is the use of a biphenyl-2-ylphosphine ligand featuring a critical remote tertiary amino group.
Base-Promoted Tandem Reaction Involving Insertion into Carbon-Carbon σ-Bonds: Synthesis of Xanthone and Chromone Derivatives
作者:Xingcan Cheng、Yuanyuan Zhou、Fangfang Zhang、Kai Zhu、Yuanyuan Liu、Yanzhong Li
DOI:10.1002/chem.201602064
日期:2016.8.26
Tandem reactions using base‐promoted processes have been developed for the synthesis of xanthone and chromone derivatives. The first examples of base‐promoted insertion reactions of isolated carbon–carbon triple bonds into carbon–carbon σ‐bonds have been reported. Using these approaches, polycyclic structures can be prepared. This reaction has the potential to become a general synthetic protocol for
Insertion of Isolated Alkynes into Carbon-Carbon σ-Bonds of Unstrained Cyclic β-Ketoesters via Transition-Metal-Free Tandem Reactions: Synthesis of Medium-Sized Ring Compounds
作者:Yuanyuan Zhou、Xianghua Tao、Qiyi Yao、Yulei Zhao、Yanzhong Li
DOI:10.1002/chem.201603798
日期:2016.12.12
transition‐metal‐free insertion of isolated alkynes into carbon–carbon σ‐bonds of unstrained cyclic β‐dicarbonyl compounds has been reported. These tandem reactions offer an efficient synthesis of medium‐sized ring or fused‐ring compounds through ring expansion. The methodology has the potential to be widely used throughout organic synthesis due to the easily accessible starting materials and mild reaction conditions