Aerobic Oxidation of Alkenes to Esters of Vicinal Diols with a<i>syn</i>-Configuration Catalyzed by I<sub>2</sub>and the H<sub>5</sub>PV<sub>2</sub>Mo<sub>10</sub>O<sub>40</sub>Polyoxometalate
作者:Ronny Neumann、Olena Branytska
DOI:10.1055/s-2005-917069
日期:——
A new method for the synthesis of vicinal diols from alkenes has been developed. Reaction of molecular iodine in the presence of a polyoxometalate as oxidation catalyst under aerobic conditions in acetic acid solvent leads to the oxidative iodoacetoxylation of an alkene, i.e. formation of a 1,2-iodoacetate. Further in situ substitution of the iodide by water yields the 1,2-diol monoacetate with a predominantly
开发了一种从烯烃合成邻二醇的新方法。在作为氧化催化剂的多金属氧酸盐存在下,在有氧条件下,在乙酸溶剂中分子碘的反应导致烯烃的氧化碘乙酰氧基化,即形成1,2-碘乙酸盐。碘化物进一步被水原位取代产生具有主要(约4.5:1)顺式构型的1,2-二醇单乙酸酯。在反应的酸性条件下进一步酯化也会生成顺式二乙酸酯。该方法对于不使用有毒锇催化剂合成顺式邻位二醇可能是有价值的。