多相光催化已成为有机合成中强大且可持续的技术;然而,石墨氮化碳(gC 3 N 4)作为非均相光催化剂用于有机转化的应用仍处于起步阶段。化学家正在积极致力于开发由 gC 3 N 4催化的新型有机转化,但这仍然具有挑战性。在此,我们描述了可见光驱动的 gC 3 N 4催化的炔烃原子转移自由基加成(ATRA)来合成有价值的(E)-β-硫代/硒基乙烯基砜。该方法具有非均相光催化、优异的区域和立体选择性、100%原子经济性、不含金属和添加剂的性质,以及覆盖(杂)芳基和烷基炔烃,特别是工业原料丙炔的广泛底物范围。此外,该方法还可应用于复杂分子的后期功能化。值得注意的是,gC 3 N 4可以在五次运行中回收并重复使用,而不会损失催化活性。机理研究表明该反应是通过能量转移过程而不是单个电子转移发生的。
A copper-catalyzedhighlyregio- and stereospecific selenosulfonation of alkynes with arylsulfonohydrazides and diphenyl diselenide has been developed. This novel three component reaction proceeds under very mild conditions and with a broad scope of substrates, providing a wide range of (E)-β-selenovinyl sulfones in good to excellent yields.
Metal-free selenosulfonylation of alkynes: rapid access to β-(seleno)vinyl sulfones via a cationic-species-induced pathway
作者:Kai Sun、Xin Wang、Fangfang Fu、Chong Zhang、Yao Chen、Lin Liu
DOI:10.1039/c6gc03420a
日期:——
A general 1,2-selenosulfonylation of alkynes with high levels of regio- and stereoselectivity was realized under mild conditions.
烯烃的1,2-硒磺化反应在温和条件下实现,具有高水平的区域和立体选择性。
1,3-Dipolar Cycloadditions of Acetylenic Sulfones in Solution and on Solid Supports
作者:Detian Gao、Huimin Zhai、Masood Parvez、Thomas G. Back
DOI:10.1021/jo801621d
日期:2008.10.17
resulted in N-O or C-O scission, in addition to cleavage from the polymer. The method provides access to a number of important classes of heterocycles, including variously substituted and functionalized triazoles, pyrazoles, 1,2-oxazoles, pyrroles, as well as their dihydro and bicyclic analogues. The success of the cycloadditions on polymer supports paves the way to future investigations of sequential transformations
A novel method for the preparation of β-keto-sulfones through the use of organoselenium reagents in the solid phase by polystyrene-supported benzeneselenosulfonate or tolueneselenosulfonate with acetylenes has been developed.