Studies on cycloaddition of spiroepoxycyclohexa-2,4-dienones with indene and sigmatropic shifts in excited states: Synthesis of benzotricyclo[5.2.2.02,6]undec-10-en-9-ones, annulated polyquinanes and bicyclo[4.2.0]octanoids
作者:Sushil Kumar Tripathi、Vishwakarma Singh
DOI:10.1016/j.tet.2018.09.045
日期:2018.11
benzotricyclo[5.2.2.02,6]undecanes endowed with a β,γ-enone chromophore. Photochemicalreaction of β,γ-enonesupondirectirradiation (1S) gave annulated bicyclo[4.2.0]octenones as a consequence of a stereoselective 1,3-acylshift. Triplet excitation of chromophoric systems led to oxa-di-π-methanereaction and gave pentacyclic products which upon cleavage of cyclopropane ring furnished benzoannulated triquinanes
Synthesis of embellished bicyclo[2.2.2]octenones and a sigmatropic 1,2-acyl shift in an excited state: a novel and stereoselective route to (±)-hirsutic acid C and complicatic acid
作者:Vishwakarma Singh、Dilip K. Tosh、Shaikh M. Mobin
DOI:10.1016/j.tetlet.2003.12.095
日期:2004.2
Formal syntheses of hirsutic acid C and complicatic acid via cycloaddition of cyclohexa-2,4-dienone with methyl methacrylate and a triplet sensitized 1,2-acyl shift are described. The X-ray crystal structure of one of the key intermediates is also reported.
[DE] NEUARTIGER VERNETZER-BAUSTEIN FÜR DIE VERWENDUNG IN REVERSIBEL VERNETZENDEN POLYMERSYSTEMEN<br/>[EN] NOVEL CROSSLINKER UNIT FOR USE IN REVERSIBLY CROSSLINKING POLYMER SYSTEMS<br/>[FR] NOUVEL ÉLÉMENT RÉTICULÉ À UTILISER DANS DES SYSTÈMES POLYMÈRES À RÉTICULATION RÉVERSIBLE
申请人:EVONIK DEGUSSA GMBH
公开号:WO2018054684A1
公开(公告)日:2018-03-29
Die Erfindung betrifft einen neuartigen Vernetzer-Baustein für die Verwendung in Diels-Alder-Vernetzungssystemen für reversibel vernetzende Polymersysteme, wobei vorliegend dieses System erstmalig aus nur einer Komponente bestehen kann.
Molecular complexity from aromatics. Cycloaddition of cyclohexa-2,4-dienones, sigmatropic 1,2-acyl shift and ring-closing metathesis: a new, efficient, and stereoselective synthesis of (±)-hirsutic acid C and medium ring carbocycles
作者:Vishwakarma Singh、Shantanu Pal、Dilip K. Tosh、Shaikh M. Mobin
DOI:10.1016/j.tet.2007.01.006
日期:2007.3
A new, stereoselective formal synthesis of hirsutic acid and medium ring carbocyclic systems from salicyl alcohol is described. Cycloaddition between electron deficient partners such as cyclohexa-2,4-dienone and methylmethacrylate, triplet sensitized 1,2-acyl shift and ring-closing metathesis are the key features of our approach. (c) 2007 Elsevier Ltd. All rights reserved.