Ruthenium-Catalyzed Cycloisomerizations of Diynols
作者:Barry M. Trost、Michael T. Rudd
DOI:10.1021/ja043097o
日期:2005.4.1
[CpRu(CH(3)CN)(3)]PF(6). The formation of five- and six-memberedrings is possible using this methodology. Secondary diynols react to form single geometrical isomeric dienones and -als. Primary diynols undergo a cycloisomerization as well as a hydrative cyclization process. The utility of primary diynol cycloisomerization is demonstrated in a synthesis of (+)-alpha-kainic acid.
An Unusual Ruthenium-Catalyzed Cycloisomerization of Alkynes and Propargyl Alcohols
作者:Barry M. Trost、Michael T. Rudd
DOI:10.1021/ja012672a
日期:2002.4.1
CpRu(NCCH3)3+PF6- catalyzes the cycloisomerization of diyne-ols to alpha,beta,gamma,delta-unsaturated aldehydes and ketones in good-to-excellent yields. 1-Hydroxy-2,7-diynes and 1-hydroxy-2,8-diynes can be utilized to form highly functionalized five- and six-membered rings, respectively. Tertiary as well as secondary propargyl alcohols are cycloisomerized to a single isomeric product. A wide variety
[EN] QUINOLONE COMPOUNDS AND PROCESS FOR PREPARATION THEREOF<br/>[FR] COMPOSÉS DE QUINOLONE ET LEUR PROCÉDÉ DE PRÉPARATION
申请人:COUNCIL OF SCIENT AND INDUSTRIAL RESEARCH AN INDIAN REGISTERED BODY INCORPORATED UNDER THE REGN OF S
公开号:WO2022044033A1
公开(公告)日:2022-03-03
The present invention relates to quinolones of formula (I) and process for its preparation by amine insertion into aryl-ynones thereof. [Formula I] The invention further relates to the process to obtain the natural products such as: graveoline, graveolinine, pseudane IV, pseudane VII, pseudane VIII and pseudane XII. The invention also describes the process for the total synthesis of waltherione F in concise approach from the quinolone synthesized. [Formula II]
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