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
Generation of sulfonyl radicals from sulfonylhydrazides has been achieved in the presence of a non-toxic iron catalyst and oxygen. The intermolecular addition of resultant sulfonyl radicals to alkenes affords β-hydroxysulfone compounds.
Synthesis of β-Hydroxysulfones from Sulfonyl Chlorides and Alkenes Utilizing Visible Light Photocatalytic Sequences
作者:Santosh K. Pagire、Suva Paria、Oliver Reiser
DOI:10.1021/acs.orglett.6b00734
日期:2016.5.6
The synthesis of β-hydroxysulfones from sulfonyl chlorides and styrenes in the presence of water by a visible light mediated atom transfer radical addition (ATRA)-like process utilizing fac[Ir(ppy)3] as photoredox catalyst was developed in high yields. This process could be combined with the visible light mediated synthesis of trifluoromethylated sulfonyl chlorides via an ATRA reaction between alkenes
以fac [Ir(ppy)3 ]为光氧化还原催化剂,通过可见光介导的原子转移自由基加成(ATRA)样方法,在水存在下由磺酰氯和苯乙烯合成β-羟基砜得到了高收率。该过程可以与烯烃和CF 3 SO 2 Cl之间的ATRA反应,利用[Cu(dap)2 Cl]作为光氧化还原催化剂,与可见光介导的三氟甲基化磺酰氯的合成相结合,证明了顺序光氧化还原过程的可能性。
Dioxygen concentration-dependent selective hydroxysulfonylation of olefins by rose bengal-sensitized photocatalysis
sulfonyl radicals are generated by a cascade of redox reactions, set off by the photocatalyst RB, between sulfonyl hydrazide and dioxygen. Attack of the sulfonyl radicals on olefins followed by oxygenation of the radical intermediates leads to hydroxysulfonylation products selectively without the requirement of a metal catalyst/additive/reductant/base, conforming to the tenets of sustainable chemistry
PQS-enabled visible-light iridium photoredox catalysis in water at room temperature
作者:Mei-jie Bu、Chun Cai、Fabrice Gallou、Bruce H. Lipshutz
DOI:10.1039/c7gc03866f
日期:——
An amphoteric PQS-attached photocatalyst has been prepared that undergoes self-aggregation in water into nanomicelles. This covalently bound species enables Ir-based photoredoxcatalysis to be conducted in the absence of additives or co-solvents. Representative reactions are described using this new catalytic system, which require no additional investment of external energy in the form of heating or