Results 41 to 50 of about 17,231 (260)
SynOpen, 2022 A concise and diastereoselective total synthesis of tetraketide and euscapholide is described in ten steps in 10.6% overall yield from acetaldehyde and (S)-pent-4-ene-1,2-diol.
Dhanraj O. Biradar +2 more
doaj +1 more source
Stereoselectivity of Macrocyclic Ring-Closing Olefin Metathesis [PDF]
Organic Letters, 2000 [reaction: see text] Macrocyclic ring-closing olefin metathesis using ruthenium catalyst 3 was performed to produce a 14-membered lactone. The E/Z ratio of lactone was high regardless of the R group (auxiliary) or the initial alkene stereochemistry.
Lee, Choon Woo, Grubbs, Robert H.
openaire +4 more sources
Rapid syntheses of difluorinated dihydropyrans [PDF]
, 2000 A very short reaction sequence opens with metal-mediated addition of commercial bromodifluoropropene to aldehydes; allylation under phase transfer catalysed conditions sets the stage for a ring closing metathesis (RCM) in the presence of commercial ...
Percy, Jonathan, Pintat, Stephane
core +1 more source
Beilstein Journal of Organic Chemistry, 2010 Seven novel Hoveyda–Grubbs precatalysts bearing an aminosulfonyl function are reported. Kinetic studies indicate an activity enhancement compared to Hoveyda’s precatalyst.
Etienne Borré +3 more
doaj +1 more source
Synthesis of Highly Stable 1,3-Diaryl-1H-1,2,3-triazol-5-ylidenes and Their Applications in Ruthenium-Catalyzed Olefin Metathesis [PDF]
, 2011 The formal cycloaddition between 1,3-diaza-2-azoniaallene salts and alkynes or alkyne equivalents provides an efficient synthesis of 1,3-diaryl-1H-1,2,3-triazolium salts, the direct precursors of 1,2,3-triazol-5-ylidenes.
Bertrand, Guy +6 more
core +2 more sources
Profluorescent substrates for the screening of olefin metathesis catalysts
Beilstein Journal of Organic Chemistry, 2015 Herein we report on a 96-well plate assay based on the fluorescence resulting from the ring-closing metathesis of two profluorophoric substrates. To demonstrate the validity of the approach, four commercially available ruthenium-metathesis catalysts were
Raphael Reuter, Thomas R. Ward
doaj +1 more source
Synthesis of Bioactive Macrocycles Involving Ring-Closing Metathesis Strategy
SynOpen, 2023 This review reports the synthesis of various bioactive macrocycles, involving ring-closing metathesis as a key step, developed since ca. 2000. These macrocycles exhibited biological activities such as antiviral, antifungal, antibacterial, and anticancer ...
Nasrin Jahan, Inul Ansary
doaj +1 more source
Tandem Cyclopropanation/Ring-Closing Metathesis of Dienynes [PDF]
Journal of the American Chemical Society, 2004 AbstractFor Abstract see ChemInform Abstract in Full Text.
Brian P, Peppers, Steven T, Diver
openaire +2 more sources
First Enantioselective Synthesis of Tetracyclic Intermediates en route to Madangamine D [PDF]
, 2017 The enantioselective synthesis of advanced tetracyclic precursors of madangamine D, bearing rings ABCD of this alkaloid, is reported. The saturated 14-membered ring is assembled from functionalized diazatricyclic intermediates 10 following either ring ...
Amat Tusón, Mercedes +4 more
core +1 more source
Chemoselective Sequential Polymerization: An Approach Toward Mixed Plastic Waste Recycling
Advanced Functional Materials, EarlyView.Inspired by biological protein metabolism, this study demonstrates the closed‐loop recycling of mixed synthetic polymers via ring‐closing depolymerization followed by a chemoselective sequential polymerizations process. The approach recovers pure polymers from mixed feedstocks, even in multilayer formats, highlighting a promising strategy to overcome a
Gadi Slor +5 more
wiley +1 more source