Sulfated tungstate/dioxygen: a new catalytic system for oxysulfonylation of styrenes to form β-keto sulfones
作者:Ganesh D. Wagh、Snehalata B. Autade、Raghavendra V. Kulkarni、Krishnacharya G. Akamanchi
DOI:10.1039/d0nj01763a
日期:——
A new system for synthesis of a wide range of β-ketosulfones using sulfated tungstate as a heterogeneous catalyst and oxygen as an environmentally benign oxidant with aryl hydrazides and styrenes as reacting counterparts has been developed. The preliminary experimental results support the involvement of free radical species. Thus, aryl sulfonyl free radicals, generated by oxidation of aryl sulfonyl
Aerobic oxysulfonylation of alkenes using thiophenols: an efficient one-pot route to β-ketosulfones
作者:Atul K. Singh、Ruchi Chawla、Twinkle Keshari、Vinod K. Yadav、Lal Dhar S. Yadav
DOI:10.1039/c4ob00776j
日期:——
We have developed a highly efficient synthetic route to β-ketosulfones via AgNO3 catalyzed oxysulfonylation of alkenes using thiophenols in the presence of air (O2) and K2S2O8 as eco-friendly oxidants. Thiophenols have been used as sulfonylation precursors for the first time in a dioxygen activation based radical process. Moreover, the protocol also offers a new and convenient method for the synthesis
我们已经开发出了一种高效的合成路线,该路线是在空气(O 2)和K 2 S 2 O 8作为生态友好型氧化剂的情况下,通过使用苯硫酚通过AgNO 3催化的烯烃的氧磺酰化反应。硫酚在基于双氧活化的自由基工艺中首次被用作磺酰化前体。此外,该方案还提供了一种在不使用任何引发剂的情况下,在室温下合成β-羟基硫化物的新型便捷方法。
Visible-light initiated direct oxysulfonylation of alkenes with sulfinic acids leading to β-ketosulfones
作者:Daoshan Yang、Ben Huang、Wei Wei、Jin Li、Gu Lin、Yaru Liu、Jiehua Ding、Pengfei Sun、Hua Wang
DOI:10.1039/c6gc01403h
日期:——
Highly efficient visible-light initiated direct oxysulfonylation of alkenes with sulfinic acids leading to β-ketosulfones has been realized under metal-free conditions.
利用高效的可见光引发的直接烯烃与亚砜酸发生氧磺化反应,从而在无金属条件下合成β-酮磺酮。
K<sub>2</sub>S<sub>2</sub>O<sub>8</sub>-Mediated Aerobic Oxysulfonylation of Olefins into β-Keto Sulfones in Aqueous Media
作者:Ruchi Chawla、Atul K. Singh、Lal Dhar S. Yadav
DOI:10.1002/ejoc.201301833
日期:2014.4
β-Ketosulfones were obtained in good to excellent yields (73–94 %) directly from unactivated olefins by employing inexpensive sodium arenesulfinate salts as sulfonylating agents and K2S2O8 as a radical initiator in open flasks and aqueousmedia at room temperature under transition-metal-free conditions. The reported oxidative sulfonylation protocol is highly practical and environmentally benign, as
Metal-free and selective cleavage of unstrained carbon–carbon single bonds: Synthesis of <font>β</font>-ketosulfones from <font>β</font>-chlorohydrins and sodium sulfinates
作者:Yanni Li、Deqiang Liang、Yu Chang、Xiangguang Li、Shaoguang Fu、Yunli Yuan、Baoling Wang
DOI:10.1080/00397911.2017.1362439
日期:2017.11.17
selective cleavage of unstrained C–C single bonds was developed. Under the catalysis of KI and in the presence of NaHCO3, the readily available α-chloro-β-hydroxy ketones underwent bond breaking and sulfonylation smoothly to afford β-ketosulfones with high efficiency and broad substrate scope. Mechanism investigations, both experimental and theoretical, showed that a retro-aldol cleavage/nucleophilic