Ruthenium-Catalyzed Tandem Olefin Metathesis−Oxidations
摘要:
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.
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.