Copper(<scp>i</scp>)-mediated synthesis of β-hydroxysulfones from styrenes and sulfonylhydrazides: an electrochemical mechanistic study
作者:Alexander O. Terent'ev、Olga M. Mulina、Dmitry A. Pirgach、Dmitry V. Demchuk、Mikhail A. Syroeshkin、Gennady I. Nikishin
DOI:10.1039/c6ra19190h
日期:——
Copper(I) halides were used as mediators in the synthesis of β-hydroxysulfones via the oxysulfonylation of styrenes using sulfonylhydrazides. The feature of the developed process lies in the combination of a copper(I) salt with oxygen—the stoichiometric oxidant. Copper(II) species are responsible for the oxidation of sulfonylhydrazides, they are generated in small amounts in the O2/Cu(I)/Cu(II) redox
卤化铜(I)在通过磺酰肼通过苯乙烯的氧磺酰化合成β-羟基砜中用作介体。所开发方法的特征在于铜(I)盐与氧气(化学计量的氧化剂)的结合。铜(II)物种负责磺酰肼的氧化,它们以O 2 / Cu(I)/ Cu(II)的形式少量生成。)氧化还原系统,它是在反应过程中形成的。这三种组分的组合使得在α-甲基苯乙烯的情况下仅能获得β-羟基砜,而在α-未取代的苯乙烯的情况下,能够以β-羟基砜为主要产物而β-酮砜为副产物。通过用NaBH 4还原包含β-羟基砜和β-酮砜两种产物的反应混合物,可以制备出良好的β-羟基砜。电化学研究表明,Cu(I)/ Cu(II)对可通过氧化还原过程有效地介导β-羟基砜的形成。