Results 201 to 210 of about 9,389 (255)

Ring-Closing Metathesis Approach to Dictyostatin

Organic Letters, 2005
[reaction: see text] An esterification/ring-closing metathesis approach to dictyostatin and discodermolide is introduced. The approach provides for facile fragment coupling of two main segments of these natural products at the C10-C11 alkene with high to complete Z-selectivity.
Cyrous O, Kangani, Arndt M, Brückner, Dennis P, Curran   +2 more
openaire   +3 more sources

2.10 Ring-Closing Metathesis

, 2016
AbstractRing-closing metathesis (RCM) has emerged as a powerful synthetic tool. Depending on the unsaturated functional groups involved, ring-closing-metathesis reactions are classified into three categories: diene ring-closing metathesis, enyne ring-closing metathesis, and diyne ring-closing metathesis.
D. Lee, V. R. Sabbasani
openaire   +2 more sources

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Equilibrium Ring-Closing Metathesis

Chemical Reviews, 2009
Sébastien Monfette, Deryn E Fogg
exaly   +3 more sources

Ring-Closing Metathesis

ChemInform, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
R. Poli, K. M. Smith
  +5 more sources

Asymmetric Ring‐Closing Metathesis with a Twist

Angewandte Chemie International Edition, 2009
AbstractA double flip! The catalyst shown, with a molybdenum stereocenter and monodentate ligands (Si=SitBuMe2), promotes asymmetric ring‐closing metathesis of a broad range of substrates. Its unprecedented activity originates from its structural fluxionality, which enables double inversion at the metal center in the course of a single catalytic cycle.
Hendrik F T, Klare, Martin, Oestreich
openaire   +2 more sources

A Ring-Closing Metathesis Strategy to Phosphonosugars

Organic Letters, 2001
[reaction: see text]. Syntheses of cyclic phosphonate (phostone) analogues of carbohydrates containing a phosphorus atom at the anomeric position are described. The ring-closing metathesis reaction of mixed allylic phenyl esters of allylphosphonic acid 2 and 22 generates the six-membered allylic phosphonates 3 and 23 in excellent yields.
D S, Stoianova, P R, Hanson
openaire   +2 more sources

Solvents for ring-closing metathesis reactions

Chemical Communications, 2008
A study of the influence of eight diverse solvents on a Grubbs II-catalysed ring-closing metathesis (RCM) reaction reveals a complex dependence of the different reaction steps on the solvent and suggests acetic acid as a useful solvent for RCM reactions.
Claire S, Adjiman, Adam J, Clarke, Gregory, Cooper, Paul C, Taylor   +3 more
openaire   +2 more sources

Enamide−Olefin Ring-Closing Metathesis

Organic Letters, 2001
[reaction: see text] The first examples of ring-closing metathesis reactions of olefin-containing enamides using ruthenium-based catalysts have been demonstrated. A preliminary investigation into the scope and limitations, leading to protected five- and six-membered cyclic enamides, will be presented.
Kinderman, S.S., van Maarseveen, J.H., Schoemaker, H.E., Hiemstra, H., Rutjes, F.P.J.T.   +4 more
openaire   +5 more sources

Oligomers as Intermediates in Ring-Closing Metathesis

Journal of the American Chemical Society, 2007
Oligomerization is kinetically favored in RCM reactions catalyzed by RuCl2(PCy3)(IMes)(CHPh), for a range of unhindered α,ω-dienes leading to large or medium-sized rings, even at dilutions designed to minimize intermolecular reaction. Reversible metathesis (i.e., ethenolysis) is inhibited by rapid volatilization of ethylene.
Jay C, Conrad, Melanie D, Eelman, João A Duarte, Silva, Sebastien, Monfette, Henrietta H, Parnas, Jennifer L, Snelgrove, Deryn E, Fogg   +6 more
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Ring closing metathesis of unprotected peptides

Chemical Communications, 2017
Brønsted acid masking of unprotected peptide sequences facilitates high yielding Ru-alkylidene catalysed RCM to cyclic dicarba peptidomimetics in solution.
Ellen C. Gleeson, W. Roy Jackson, Andrea J. Robinson   +2 more
openaire   +2 more sources