Metal-free and light-promoted radical iodotrifluoromethylation of alkenes with Togni reagent as the source of CF<sub>3</sub> and iodine
作者:Redouane Beniazza、Maxime Douarre、Dominique Lastécouères、Jean-Marc Vincent
DOI:10.1039/c7cc00214a
日期:——
Iodotrifluoromethylation of alkenes is effectively conducted by combining benzophenone, “black light”, isopropanol and Togni reagent 1 as the source of both the CF3 group and iodine atom.
A Facile and Selective Cleavage of Prenyl Esters Catalyzed by CeCl3 · 7 H2O-NaI
作者:J. S. Yadav、B. V. Subba Reddy、C. Venkateshwara Rao、P. K. Chand、A. R. Prasad
DOI:10.1055/s-2002-19320
日期:——
A highly selective cleavage of prenyl esters has been achieved in high yields using CeCl 3 .7 H 2 O-NaI in refluxing acetonitrile under neutral conditions. This method is mild and compatible with a wide variety of functional groups such as BOC, Cbz, acetate, allyl, benzyl, tetrahydropyranyl, PMB ethers, allyl, methyl, and benzyl esters present in the molecule.
在中性条件下在回流乙腈中使用CeCl 3 .7 H 2 O-NaI 以高产率实现了异戊二烯酯的高选择性裂解。该方法温和且与分子中存在的各种官能团兼容,例如 BOC、Cbz、乙酸酯、烯丙基、苄基、四氢吡喃基、PMB 醚、烯丙基、甲基和苄基酯。
Cyclopropanation of Terminal Alkenes through Sequential Atom‐Transfer Radical Addition/1,3‐Elimination
作者:Nicholas D. C. Tappin、Weronika Michalska、Simon Rohrbach、Philippe Renaud
DOI:10.1002/anie.201907962
日期:2019.10
An operationally simple method to affect an atom-transfer radical addition of commercially available ICH2 Bpin to terminal alkenes has been developed. The intermediate iodide can be transformed in a one-pot process into the corresponding cyclopropane upon treatment with a fluoride source. This method is highly selective for the cyclopropanation of unactivated terminal alkenes over non-terminal alkenes
A simple, mild and efficient procedure for selective cleavage of prenyl esters using silica-supported sodium hydrogen sulphate as a heterogenous catalyst
作者:C Ramesh、G Mahender、N Ravindranath、Biswanath Das
DOI:10.1016/s0040-4039(02)02858-7
日期:2003.2
Prenyl esters were selectively and efficiently cleaved under slightly acidic reaction conditions using silica-supported sodium hydrogen sulfate as a heterogenous catalyst at room temperature to regenerate the parent carboxylic acids in very high yields.