Tandem Metathesis Reactions of Oxabicyclo[2.2.1]heptenes: Studies on the Spirocyclic Core of Cyclopamine

2011 ◽  
Vol 13 (9) ◽  
pp. 2433-2435 ◽  
Author(s):  
E. Zachary Oblak ◽  
Narendran G-Dayanandan ◽  
Dennis L. Wright
Keyword(s):  
Metathesis Reactions ◽  
Tandem Metathesis

Unusual macrocyclic spirocycles from tandem metathesis reactions

2002 ◽  
Vol 43 (44) ◽  
pp. 7851-7854 ◽  
Author(s):  
Robert A.J. Wybrow ◽  
Leigh A. Johnson ◽  
Benoit Auffray ◽  
Wesley J. Moran ◽  
Harry Adams ◽  
...  
Keyword(s):  
Metathesis Reactions ◽  
Tandem Metathesis

Unusual Macrocyclic Spirocycles from Tandem Metathesis Reactions.

ChemInform ◽  
2003 ◽  
Vol 34 (3) ◽  
Author(s):  
Robert A. J. Wybrow ◽  
Leigh A. Johnson ◽  
Benoit Auffray ◽  
Wesley J. Moran ◽  
Harry Adams ◽  
...  
Keyword(s):  
Metathesis Reactions ◽  
Tandem Metathesis

The use of d-mannitol-derived C2-symmetric trienes in tandem metathesis reactions towards valuable lactones

Tetrahedron ◽  
2008 ◽  
Vol 64 (48) ◽  
pp. 10853-10859 ◽  
Author(s):  
Nassima Riache ◽  
Alain Blond ◽  
Bastien Nay
Keyword(s):  
Metathesis Reactions ◽  
Tandem Metathesis

Catalytic Carbonyl-Olefin Metathesis of Aliphatic Ketones: Iron(III) HomoDimers as Lewis Acidic Superelectrophiles

2018 ◽  
Author(s):  
Haley Albright ◽  
Paul S. Riehl ◽  
Christopher C. McAtee ◽  
Jolene P. Reid ◽  
Jacob R. Ludwig ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Olefin Metathesis ◽  
Acid Activation ◽  
Lewis Acid Catalysts ◽  
Distinct Mode ◽  
Aliphatic Ketones ◽  
Carbon Carbon Bond ◽  
Metathesis Reactions ◽  
Acid Catalyzed

<div>Catalytic carbonyl-olefin metathesis reactions have recently been developed as a powerful tool for carbon-carbon bond</div><div>formation. However, currently available synthetic protocols rely exclusively on aryl ketone substrates while the corresponding aliphatic analogs remain elusive. We herein report the development of Lewis acid-catalyzed carbonyl-olefin ring-closing metathesis reactions for aliphatic ketones. Mechanistic investigations are consistent with a distinct mode of activation relying on the in situ formation of a homobimetallic singly-bridged iron(III)-dimer as the active catalytic species. These “superelectrophiles” function as more powerful Lewis acid catalysts that form upon association of individual iron(III)-monomers. While this mode of Lewis acid activation has previously been postulated to exist, it has not yet been applied in a catalytic setting. The insights presented are expected to enable further advancement in Lewis acid catalysis by building upon the activation principle of “superelectrophiles” and broaden the current scope of catalytic carbonyl-olefin metathesis reactions.</div>

Nickel-Catalyzed Inter- and Intramolecular Carbon-Sulfur Bond Metathesis by Reversible Arylation

2019 ◽  
Author(s):  
Tristan Delcaillau ◽  
Alessandro Bismuto ◽  
Zhong Lian ◽  
Bill Morandi
Keyword(s):  
Good Yield ◽  
Functional Group ◽  
Product Formation ◽  
Single Bond ◽  
Ring Closing Metathesis ◽  
Catalytic Systems ◽  
Metathesis Reactions ◽  
New Applications ◽  
Further Development ◽  
Sulfur Bond

A nickel-catalyzed carbon-sulfur bond metathesis has been developed to access high-value thioethers. 1,2-bis(dicyclohexylphosphino)ethane (dcype) is essential to promote this highly functional group tolerant reaction. Further, synthetically challenging macrocycles could be obtained in good yield in an unusual example of ring-closing metathesis which does not involve alkene bonds. In-depth organometallic studies support a reversible Ni(0)-Ni(II) pathway to product formation. Overall, this work does not only disclose a more sustainable and more functional group tolerant alternative to previous catalytic systems based on Pd, but also presents new applications and mechanistic information which are highly relevant to the further development and application of unusual single bond metathesis reactions.

Self-Healable Polyurethane Elastomer Based on Dual Dynamic Covalent Chemistry Using Diels–Alder “Click” and Disulfide Metathesis Reactions

2021 ◽  
Vol 3 (2) ◽  
pp. 847-856
Author(s):  
Prasanta Kumar Behera ◽  
Sagar Kumar Raut ◽  
Prantik Mondal ◽  
Shrabana Sarkar ◽  
Nikhil K. Singha
Keyword(s):  
Diels Alder ◽  
Polyurethane Elastomer ◽  
Dynamic Covalent Chemistry ◽  
Metathesis Reactions
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