Base-Promoted Tandem Reaction towards Conjugated Dienone or Chromone Derivatives with a Cyano Group: Insertion of Alkynes into C-C σ-Bonds of 3-Oxopropanenitriles
作者:Qiyi Yao、Lingkai Kong、Fangfang Zhang、Xianghua Tao、Yanzhong Li
DOI:10.1002/adsc.201700565
日期:2017.9.18
alkynes into the C–C σ-bonds of α-cyano ketones were established to construct highlyfunctionalizedconjugated olefins or chromone derivativesvia transition metal-free tandem reactions. These reactions are initialized through the nucleophilic attack of α-cyano ketones to alkynones followed by intramolecular nucleophilic addition/ring-opening to furnish the cyano-containing alkenes. In the cases of alkynones
Base-mediated insertion reaction of alkynes into carbon–carbon σ-bonds of ethanones: synthesis of hydroxydienone and chromone derivatives
作者:Fangfang Zhang、Qiyi Yao、Yang Yuan、Murong Xu、Lingkai Kong、Yanzhong Li
DOI:10.1039/c7ob00476a
日期:——
Transition-metal free insertions of alkynes into carbon–carbon σ-bonds of ethanones have been reported. These tandem reactions offer an efficient synthesis of hydroxydienones and multi-substituted chromones. This is the first example of base-promoted insertion reactions of isolated carbon–carbon triple bonds into carbon–carbon σ-bonds with active methylene compounds bearing only one electron-withdrawing
A Mild, Highly Efficient Addition of Alkynes to Aldehydes Catalyzed by Titanium Dioxide‐Supported Silver Nanoparticles
作者:Min Yu、Yong Wang、Weijiang Sun、Xiaoquan Yao
DOI:10.1002/adsc.201100518
日期:2012.1
Titaniumdioxide‐supportedsilvernanoparticles were utilized as a highlyefficient catalyst for the addition of terminal alkynes to aldehydes to prepare propargylic alcohols with the promotion by triphenylphosphine. Both a significant support effect and a ligand effect were observed in the catalytic reaction. With this protocol, various propargylic alcohol derivatives were synthesized from aldehydes
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