Iron-Catalyzed Tandem Conia–Ene/Friedel–Crafts Reactions of <i>o</i>-Alkynyldihydrochalcones: Access to Benzo[<i>b</i>]fluorenes
作者:Sikkandarkani Akbar、Kannupal Srinivasan
DOI:10.1021/acs.joc.5b02391
日期:2016.2.5
o-Alkynyldihydrochalcones when treated with a catalytic amount of anhydrous FeCl3 in refluxing 1,2-dichloroethane underwent tandem Conia–ene and Friedel–Craftsreactions to yield benzo[b]fluorenederivatives in good yields.
在回流的1,2-二氯乙烷中用催化量的无水FeCl 3处理邻-炔基二氢查耳酮时,串联进行Conia-ene和Friedel-Crafts反应,以高收率得到苯并[ b ]芴衍生物。
Iodine-Catalyzed Synthesis of Highly Functionalized 1<i>H</i>-Indene Derivatives from Michael Adducts of<i>o</i>-Alkynylarene Chalcones with Diethyl Malonate
作者:Sikkandarkani Akbar、Kannupal Srinivasan
DOI:10.1002/ejoc.201501141
日期:2015.12
Upon treatment with a substoichiometric amount of iodine in ethanol under reflux conditions, the Michaeladducts of o-alkynylarene chalcones with diethylmalonate underwent 5-exo-dig Conia-ene cyclization followed by isomerization to yield highlyfunctionalized1H-indenederivatives in good yields.
Iron(<scp>iii</scp>) halide or iodine-promoted synthesis of 3-haloindene derivatives from o-alkynylarene chalcones
作者:Sikkandarkani Akbar、Kannupal Srinivasan
DOI:10.1039/c4ra14935a
日期:——
o-Alkynylarene chalcones, when treated with ferric halides/iodine, undergo cyclization to give synthetically important 3-haloindene derivatives in good yields. The reactions proceed through Lewis acid-promoted intramolecular nucleophilic addition of the alkyne unit to the enone moiety followed by halide capture of the resulting vinyl carbocation intermediate. The reactions are operationally simple