Increasing the Structural Span of Alkyne Metathesis
作者:Peter Persich、Josep Llaveria、Rudy Lhermet、Teresa de Haro、Robert Stade、Azusa Kondoh、Alois Fürstner
DOI:10.1002/chem.201302320
日期:2013.9.23
new generation of alkyne metathesis catalysts, which are distinguished by high activity and an exquisite functional group tolerance, allows the scope of this transformation to be extended beyond its traditional range. They accept substrates that were previously found problematic or unreactive, such as propargyl alcohol derivatives, electron‐deficient and electron‐rich acetylenes of various types, and
作者:Birte Haberlag、Matthias Freytag、Constantin G. Daniliuc、Peter G. Jones、Matthias Tamm
DOI:10.1002/anie.201207772
日期:2012.12.21
Now even terminal: The 2,4,6‐trimethylbenzylidyne complexes [MesCMOC(CF3)2Me}3] (M=Mo, W) were synthesized from [Mo(CO)6] and [W(CO)6], respectively. The molybdenum complex is an efficient catalyst for the metathesis of internal and terminalalkynes and also for the ring‐closing metathesis of internal and terminal α,ω‐diynes at room temperature and low catalyst concentrations.
Enantioselective Epoxidation of Conjugated <i>cis</i>-Enynes by Chiral Dioxirane
作者:Christopher P. Burke、Yian Shi
DOI:10.1021/jo070205r
日期:2007.5.1
This paper describes a highly chemo- and enantioselectiveepoxidation of conjugated cis-enynes using readily available glucose-derived ketone 2 as catalyst and Oxone as oxidant to form cis-propargyl epoxides in high ee's. The interaction between the alkyne group of the substrate and the oxazolidinone moiety of the ketone catalyst as well as the interactions between the substituents on enynes and the