Results 91 to 100 of about 9,019 (233)
Iodine-catalyzed diazo activation to access radical reactivity
Nature Communications, 2018 Radical reactivity of diazo compounds, useful organic building blocks, is yet underexplored. Here, the authors report an iodine-catalyzed radical activation of diazo compounds affording a variety of substituted cyclopropanes, pyrroles and epoxides under ...
Pan Li +5 more
doaj +1 more source
Schwefel‐gesteuerter Aufbau von Vinylcyclopropanen ausgehend von 1,3‐Dienen
Angewandte Chemie, Volume 138, Issue 25, 15 June 2026.Schwefel übernimmt die Kontrolle: Ein Thioether wirkt als molekularer Dirigent, der die Carbenaddition an 1,3‐Diene mit außergewöhnlicher Regio‐ und Diastereokontrolle lenkt. Dabei werden schwefelhaltige Vinylcyclopropane (S‐VCPs) erhalten, die mittels herkömmlicher Methoden nur schwer zugänglich sind.
Anna Keimer +6 more
wiley +1 more source
Catalytic Enantioselective Ring-Opening Reactions of Cyclopropanes
This review describes the development of enantioselective methods for the ring opening of cyclopropanes. Both approaches based on the reaction of nonchiral cyclopropanes and (dynamic) kinetic resolutions and asymmetric transformations of chiral ...
Pirenne, Vincent +2 more
core +1 more source
Enantioselective Addition of Nitrones to Activated Cyclopropanes
, 2016 In this paper, we demonstrate the first examples of chiral Lewis acid catalysis in the formation of tetrahydro-1,2-oxazines with very high enantioselectivity starting with diactivated cyclopropanes and nitrones (>90% yields and ee).
Mukund P. Sibi (1633159) +2 more
core +1 more source
Synthesis and reactivity of cyclopropanes and cyclopropenes [PDF]
, 2011 Activated cyclopropanes have been extensively used in synthetic chemistry as precursors for cycloaddition reactions. The rationale behind this is their ability to undergo ring-opening when activated by a Lewis acid, this can be enhanced further by the ...
Hayley T.A. Watson (7167347) +1 more
core
Synthesis of Nitrogen Heterocycles via Directed Carbonylative C–C Bond Activation of Cyclopropanes
CHIMIA, 2018 This review concentrates on recent developments from our laboratory concerning the Rh-catalyzed carbonylative C–C bond activation of cyclopropanes.
Andrew G. Dalling, John F. Bower
doaj +1 more source
Sulfur‐Directed Construction of Vinyl Cyclopropanes from 1,3‐Dienes
Angewandte Chemie International Edition, Volume 65, Issue 25, 15 June 2026.Sulfur takes control. A pending thioether acts as a molecular compass, directing carbene addition to the 1,3‐diene scaffold with exceptional regio‑ and diastereocontrol to forge sulfur‐substituted vinyl cyclopropanes (S‐VCPs) — molecular architectures inaccessible via conventional cyclopropanation strategies.
Anna Keimer +6 more
wiley +1 more source
South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde, 2003 Click on the link to view.
openaire +2 more sources
Direct Synthesis of Cyclopropanes from Gem-Dialkyl Groups Through Double C–H Activation
, 2020 Cyclopropanes are important structural motifs found in numerous bioactive molecules, and a number of methods are available for their synthesis. However, one of the simplest cyclopropanation reactions involving the intramolecular coupling of two C–H bonds
Olivier, Baudoin +4 more
core +1 more source