A practical, general and efficient protocol for the catalytic epoxidation of alkenes has been developed. The in situ generation of reactive dioxiranes capable of epoxidizing a variety of alkenes under biphasic conditions has been accomplished using phase transfer catalysts bearing a carbonyl group. Optimal epoxidation conditions employ 10 mol % of 1-dodecyl-1-methyl-4-oxopiperidinium triflate (8d(+)OTf(-)) in a CH2Cl2/pH 7.5-8.0 biphase using potassium monoperoxosulfate (Oxone) as the oxidant. Optimization of the conditions identified (1) slow addition rate, (2) pH 7.5-8.0, (3) N-dodecyl chain, and (4) the triflate salt as key experimental and structural variables. A selection of nine olefins was successfully oxidized to the corresponding epoxides in 83-96% yield.
This present invention provides new compounds for use as zinc ligand sensors in cellular imaging. These compounds are highly sensitive imagining agents that can be used with techniques such a laser scanning microscopy in intact cells in culture or in tissue preparations.
US8530183B2
申请人:——
公开号:US8530183B2
公开(公告)日:2013-09-10
[EN] ZINC SENSORS FOR CELLULAR IMAGING<br/>[FR] CAPTEURS DE ZINC POUR IMAGERIE CELLULAIRE
申请人:UNIV TEXAS
公开号:WO2011156728A2
公开(公告)日:2011-12-15
This present invention provides new compounds for use as zinc ligand sensors in cellular imaging. These compounds are highly sensitive imagining agents that can be used with techniques such a laser scanning microscopy in intact cells in culture or in tissue preparations.