A range of substituted cycloalkene-1,1-dicarboxylat es was synthesized through olefinmetathesis starting from readily available acylic malonate pre cursors in an efficient fashion. As a metathesis catalyst, a Grubbs II-type catalyst was used in the se experiments, which were run in water and gave the cyclic malonate products with high convers ions of 94-100%. The catalytic amount was in the range
一系列取代的环烯烃-1,1-二羧酸酯是通过烯烃复分解以有效的方式从容易获得的酰基丙二酸酯前体开始合成的。作为复分解催化剂,在这些实验中使用了 Grubbs II 型催化剂,其在水中运行并得到具有 94-100% 高转化率的环状丙二酸产物。取决于起始材料的结构,催化量在0.5-5mol%的范围内。证明了该复分解反应在水中的普遍性及其适用于制备五元和六元和烷基以及芳基取代的前手性环烯烃-1,1 二羧酸酯。
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.