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
Metal-free one-pot synthesis of benzofurans with ynones and quinones through aza-Michael/Michael/annulation sequence
作者:Hai-Lei Cui、Hui-Qing Deng、Jin-Ju Lei
DOI:10.1016/j.tet.2017.11.014
日期:2017.12
metal-free one-pot synthesis of benzofuran derivatives starting from simple ynones has been developed. Various functionalizedbenzofurans closely related to bioactive molecules can be obtained in moderate to good yields (up to 90%) through aza-Michael/Michael/annulation sequence. Preparative scale synthesis of benzofurans has also been successfully achieved. The application of the benzofuran products has
已经开发了一种方便的无金属一锅合成苯并呋喃衍生物的方法,该方法可从简单的炔酮开始。可以通过aza-Michael / Michael / annulation序列以中等到良好的产率(高达90%)获得与生物活性分子密切相关的各种功能化的苯并呋喃。苯并呋喃的制备规模合成也已成功实现。苯并呋喃产品的应用已通过轻松转化为高度功能化的分子得到了展示,这对药物化学和有机材料化学具有重大的前景。