Allylic Oxidations Catalyzed by Dirhodium Catalysts under Aqueous Conditions
申请人:Doyle Michael P.
公开号:US20090093638A1
公开(公告)日:2009-04-09
The present invention relates to compositions and methods for achieving the efficient allylic oxidation of organic molecules, especially olefins and steroids, under aqueous conditions. The invention concerns the use of dirhodium (II,II) “paddlewheel complexes, and in particular, dirhodium carboximate and tert-butyl hydroperoxide as catalysts for the reaction. The use of aqueous conditions is particularly advantageous in the allylic oxidation of 7-keto steroids, which could not be effectively oxidized using anhydrous methods, and in extending allylic oxidation to enamides and enol ethers.
Efficient One-Pot Conversion of Carbonyl Compounds to Their α,β-Unsaturated Derivatives Using a Recoverable, Minimally Fluorous Organoselenium Reagent
作者:David Crich、Gregory R. Barba
DOI:10.1021/ol005669p
日期:2000.4.1
A protocol for the preparation of a fluorous arylselenenyl chloride is described. This selenenyl chloride may be used for the direct alpha-selenation of ketones and, following oxidation and syn-elimination, formation of alpha,beta-unsaturated carbonylcompounds. Treatment of the crude reaction mixtures with sodium metabisulfite reduces the various selenium species to the diaryl diselenide, which is
LIGANDS FOR NEMATODE NUCLEAR RECEPTORS AND USES THEREOF
申请人:Mangelsdorf J. David
公开号:US20070219173A1
公开(公告)日:2007-09-20
Anti-nematode compounds, compositions, and methods for identifying such compounds are disclosed, where the compounds have the formula I:
where Q, Q′, R
1
, R
2
, and n are defined herein.