Tetraarylphosphonium Salts as Soluble Supports for Oxidative Catalysts and Reagents
作者:Marie-Noelle Roy、Jean-Christophe Poupon、André B. Charette
DOI:10.1021/jo901509z
日期:2009.11.20
Tetraarylphosphonium (TAP)-supported DMSO, TEMPO, and DIB reagents were synthesized and used for the oxidation of alcohols, including Swern oxidation and for the α-acetoxylation of ketones. By taking advantage of the predictable solubility properties of the TAP unit, simple precipitation and filtration of the phosphonium moiety permit complete separation of the desired oxidation products. This paper
Epothilone synthesis building blocks III and IV: asymmetrically substituted acyloins and acyloin derivatives, methods for their production and methods for the production of epothilones B, D and epothilone derivatives
申请人:——
公开号:US20040082651A1
公开(公告)日:2004-04-29
The present invention is directed to novel acyloins, their derivatives, methods for their production and their use for the production of novel epothilones and their derivatives. In addition, the invention is directed to the building blocks for epothilone synthesis, methods for their production and the use of synthetic building blocks for the production of epothilones and their derivatives.
Reported here for the first time is the iodobenzene-catalyzed alpha-oxidation of ketones, in which diacyloxy(phenyl)-lambda3-iodanes generated in situ act as real oxidants of ketones and m-chloroperbenzoic acid serves as a terminal oxidant. Oxidation of a ketone with m-chloroperbenzoic acid in acetic acid in the presence of a catalytic amount of iodobenzene, BF3.Et2O, and water at room temperature under argon affords an alpha-acetoxy ketone in good yield. p-Methyl- and p-chloroiodobenzene also serve as efficient catalysts in this direct oxidation. We found that when the reaction was carried out in the absence of a catalytic amount of iodobenzene, Baeyer-Villiger oxidation of a ketone took place. It is noted that use of water and BF3.Et2O is crucial to the success of this alpha-acetoxylation.
EPOTHILONE-SYNTHESEBAUSTEINE III UND IV: UNSYMMETRISCH SUBSTITUIERTE ACYLOINE UND ACYLOINDERIVATE, VERFAHREN ZU DEREN HERSTELLUNG SOWIE VERFAHREN ZUR HERSTELLUNG VON EPOTHILON B, D UND EPOTHILONDERIVATEN
申请人:Morphochem AG
公开号:EP1358144A1
公开(公告)日:2003-11-05
EPOTHILON-SYNTHESEBAUSTEINE I: UNSYMMETRISCH SUBSTITUIERTE ACYLOINE UND ACYLOINDERIVATE, VERFAHREN ZU DEREN HERSTELLUNG SOWIE DEREN VERWENDUNG ZUR HERSTELLUNG VON EPOTHILONEN UND EPOTHILONDERIVATEN