金属有机骨架 (MOF) 通道内定义明确的 Fe 3+孤立单金属原子和 Ag 2亚纳米金属簇的组合首次通过单晶 X 射线衍射进行了报道和表征。所得杂化材料,分子式为[Ag 0 2 (Ag 0 ) 1.34 Fe III 0.66 ]@Na I 2 {Ni II 4 [Cu II 2 (Me 3 mpba) 2 ] 3 }·63H 2 O ( Fe 3+银0 2 @MOF),能够在一锅中催化苯乙烯前所未有地直接转化为苯乙炔。特别是,Fe 3+ Ag 0 2 @MOF——可以很容易地以克规模获得——对苯乙烯与苯砜的无 TEMPO 氧化交叉偶联表现出优异的催化活性,以产生乙烯基砜,产率高达 >99 %,最终原位转化为相应的苯乙炔产物。这里展示的结果构成了一个典型的例子,说明在明确定义的固体催化剂中合成不同的金属物种,结合溶液中有机反应的真正金属催化剂的物种形成,允许设计一个新的具有挑战性的反应。
The synthesis of vinyl sulfone derivatives via the reaction of arylpropiolic acids, K2S2O5, and aryl boronic acids is reported. The CuBr2/1,10-phenanthroline catalytic system in the presence of acetic acid provides the desired vinyl sulfones in moderate to good yield. Furthermore, the methodology features excellent functional group tolerance.
报道了通过芳基丙炔酸、K 2 S 2 O 5和芳基硼酸的反应合成乙烯基砜衍生物。在乙酸存在下的 CuBr 2 /1,10-菲咯啉催化体系以中等至良好的产率提供所需的乙烯基砜。此外,该方法具有出色的官能团耐受性。
Radical C(sp<sup>3</sup>)–H alkenylation, alkynylation and allylation of ethers and amides enabled by photocatalysis
作者:Subhasis Paul、Joyram Guin
DOI:10.1039/c7gc00840f
日期:——
enables selective incorporation of alkenyl, alkynyl and allyl functional groups into the C(sp3)–H bond under green reaction conditions is developed. The process is based on the catalytic formation of α-alkoxyl/α-amidyl radicals via the homolytic activation of the C(sp3)–H bond of ethers/amides with a catalytic amount of diarylketone in the presence of a household fluorescent light bulb. This simple reaction
Visible-light-mediated alkylation of 4-alkyl-1,4-dihydropyridines with alkenyl sulfones
作者:Fuyang Yue、Jianyang Dong、Yuxiu Liu、Qingmin Wang
DOI:10.1039/d1ob01806j
日期:——
Herein we report a mild, general protocol for visible-light-mediated alkylation of 4-alkyl-1,4-dihydropyridines with alkenyl sulfones. The protocol permits efficient functionalization of sulfones with a broad range of cyclic and acyclic secondary and tertiary alkyl groups and is scalable to the gram level. Its excellent functional group tolerance and mildness make it suitable for late-stage functionalization
Visible-Light-Mediated Alkenylation of Alkyl Boronic Acids without an External Lewis Base as an Activator
作者:Fuyang Yue、Jianyang Dong、Yuxiu Liu、Qingmin Wang
DOI:10.1021/acs.orglett.1c00399
日期:2021.4.2
Herein we report a protocol for the direct visible-light-mediated alkenylation of alkyl boronic acids at room temperature without an external Lewis base as an activator, and we propose a mechanism involving benzenesulfinate activation of the alkyl boronic acids. The protocol permits the efficient functionalization of a broad range of cyclic and acyclic primary and secondary alkyl boronic acids with
Ligand-free Pd-catalyzed highly selective arylation of activated and unactivated alkenes <i>via</i> oxidative and reductive heck coupling
作者:Mixiang Tian、Qinghong Cui、Qiuling Xu、Wenwen Wu、Yuxian Wang、Kun Wei、Ruifen Sun、Junliang Wang
DOI:10.1039/d3ra08186a
日期:——
We developed a solvent-free, mild, and efficient protocol for Heck–Mizoroki reactions under ultrasonic irradiation in open air, which would be predictable and robust using a range of substrates.