Rendering Schrock-type Molybdenum Alkylidene Complexes Air Stable: User-Friendly Precatalysts for Alkene Metathesis
作者:Johannes Heppekausen、Alois Fürstner
DOI:10.1002/anie.201102012
日期:2011.8.16
A matter of convenience: Schrock molybdenumalkylidenes are amongst the most powerful olefin metathesis catalysts known to date, but their sensitivity to air and moisture mandates their handling in a glove‐box or by Schlenk techniques. This inconvenience is circumvented by using the corresponding phenanthroline‐ or bipyridine adducts, which are bench‐stable and hence very user‐friendly. The active
Effects of Olefin Substitution on the Ring-Closing Metathesis of Dienes
作者:Thomas A. Kirkland、Robert H. Grubbs
DOI:10.1021/jo970877p
日期:1997.10.1
Ruthenium alkylidene 1 and molybdenum alkylidene 2 have been utilized in the ring-closing metathesis (RCM) of dienes containing gem-disubstituted olefins to yield td-and tetrasubstituted cyclic olefins. Dienes with sterically demanding and/or electron-withdrawing substituents such as Ph, CO2Me, and Bu-t were cyclized successfully with 2, but did not cyclize with 1. Tetrasubstituted cyclic olefins could be formed with 2, but not using alkylidene-1. Dienes with allylic functional groups yielded functionalized cyclic olefins when treated with 1.
Ruthenium-Catalyzed Tandem Olefin Metathesis−Oxidations
作者:Andrew A. Scholte、Mi Hyun An、Marc L. Snapper
DOI:10.1021/ol061837n
日期:2006.10.1
The utility of Grubbs' 2nd generation metathesis catalyst has been expanded by the development of two tandem olefin metathesis/oxidation protocols. These ruthenium-catalyzed processes provide cis-diols or r-hydroxy ketones from simple olefinic starting materials.
Traceless Thioacid-Mediated Radical Cyclization of 1,6-Dienes
作者:Dylan M. Lynch、Mark D. Nolan、Conor Williams、Leendert Van Dalsen、Susannah H. Calvert、Fabrice Dénès、Cristina Trujillo、Eoin M. Scanlan