Nucleophilic substitution of propargyl alcohols with aliphatic alcohols, aliphatic amines and heterocycles catalyzed by 4-nitrobenzenesulfonic acid: a scalable and metal-free process
作者:S. Antony Savarimuthu、D.G. Leo Prakash、S. Augustine Thomas
DOI:10.1016/j.tetlet.2014.02.086
日期:2014.5
It is aimed to provide a cost effective p-NBSA catalyzed nucleophilic substitution of propargyl alcohols with alcohols, amines and heterocycles, without employing corrosive and costly metal catalysts, toxic solvents and column chromatography for purification. A systematic study of CC, CN and CO bond formation and efficacy of the scalability have also been confirmed.
Selective Insertion of Alkynes into C–C σ Bonds of Indolin-2-ones: Transition-Metal-Free Ring Expansion Reactions to Seven-Membered-Ring Benzolactams or Chromone Derivatives
作者:Mengdan Wang、Yajie Yang、Bo Song、Liqiang Yin、Shuhui Yan、Yanzhong Li
DOI:10.1021/acs.orglett.9b04081
日期:2020.1.3
An unprecedented ring expansion reaction of indolin-2-ones with alkynyl ketones under transition-metal-free conditions has been developed. Base-promoted selective cleavage of a C-Cσbond of the amide is the key in this process, which provides a straightforward and efficient way to synthesize seven-membered-ring benzolactams or chromone derivatives. The significant advantages of this method include
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