通过将氢原子转移和无痕导向策略与 SR 作为瞬态基团相结合,实现了第一次 Cu 催化的丰富末端炔烃的 1,2,5-三官能化,以中等至优异的产率提供高度官能化的醛,具有广泛的底物范围。该方法的合成效用通过克级反应和所得产物的下游转化得到证明。鉴于在单个反应中高效安装三种不同的官能团,它可以作为一种非常有吸引力的方法,用于从容易获得的起始材料快速组装复杂分子。
炔基硅烷是合成化学、药物化学、功能材料和生命科学中常用的重要结构单元。在此,我们报告了一种使用氢原子转移(HAT)策略与可见光驱动光催化相结合的方法,以实现苯磺酰乙炔和叔硅烷之间的直接偶联反应,以及在活性物质存在下氢硅烷的多种炔基化反应。通过这一策略实现了群体。值得注意的是,二氢烷基/芳基硅烷也适用于 4CzIPN 和奎宁环的 HAT 光催化方案。
通过将氢原子转移和无痕导向策略与 SR 作为瞬态基团相结合,实现了第一次 Cu 催化的丰富末端炔烃的 1,2,5-三官能化,以中等至优异的产率提供高度官能化的醛,具有广泛的底物范围。该方法的合成效用通过克级反应和所得产物的下游转化得到证明。鉴于在单个反应中高效安装三种不同的官能团,它可以作为一种非常有吸引力的方法,用于从容易获得的起始材料快速组装复杂分子。
Ir-Catalyzed Regio- and Stereoselective Hydrosilylation of Internal Thioalkynes: A Combined Experimental and Computational Study
作者:Li-Juan Song、Shengtao Ding、Yong Wang、Xinhao Zhang、Yun-Dong Wu、Jianwei Sun
DOI:10.1021/acs.joc.6b00854
日期:2016.8.5
However, the exploitation for selectivehydrosilylation of unsymmetrical internal alkynes has been limitedly known. Described here is a new example of this type. Specifically, [(cod)IrCl]2 catalyzes the efficient and mild hydrosilylation of thioalkynes by various silanes with excellent regio- and stereoselectivity. DFT studies suggested a new mechanism involving Ir(I) hydride as the key intermediate.
Highly Regio- and Stereoselective Hydrosilylation of Internal Thioalkynes under Mild Conditions
作者:Shengtao Ding、Li-Juan Song、Yong Wang、Xinhao Zhang、Lung Wa Chung、Yun-Dong Wu、Jianwei Sun
DOI:10.1002/anie.201500372
日期:2015.5.4
A general and mildhydrosilylation of thioalkynes is described. With the cationic catalyst [Cp*Ru(MeCN)3]+ and the bulky silane (TMSO)3SiH, a range of thioalkynes underwent smooth hydrosilylation at room temperature with excellent α regioselectivity and syn stereoselectivity. DFT calculations provided important insight into the mechanism, particularly the unusual syn selectivity with the [Cp*Ru(MeCN)3]+
Iridium-Catalyzed Intermolecular Azide-Alkyne Cycloaddition of Internal Thioalkynes under Mild Conditions
作者:Shengtao Ding、Guochen Jia、Jianwei Sun
DOI:10.1002/anie.201309855
日期:2014.2.10
An iridium‐catalyzed azide–alkynecycloaddition reaction (IrAAC) of electron‐rich internal alkynes is described. It is the first efficient intermolecular AAC of internal thioalkynes. The reaction exhibits remarkable features, such as high efficiency and regioselectivity, mild reaction conditions, easy operation, and excellent compatibility with air and a broad spectrum of organic and aqueous solvents
1-Alkynyl(phenyl)-lambda 3-iodanes undergo selective transfer of the alkynyl groups over the phenylgroup onto diphenyl chalcogens. Exposure of 1-alkynyl(phenyl)-lambda 3-iodanes to diphenyl chalcogens (S, Se, and Te) in dichloromethane or 1,2-dichloroethane affords 1-alkynyl(diphenyl)sulfonium, -selenonium, and -telluronium salts in high yields.
Copper Nanoparticle Catalyzed Formation of C–S Bonds through Activation of S–S and C–H Bonds: An Easy Route to Alkynyl Sulfides
作者:Kang Park、Balaji Mohan、Sori Hwang、Hyunje Woo
DOI:10.1055/s-0035-1560458
日期:——
for copper nanoparticle catalyzed ligand-free S–Csp bond formation was developed by using dimethyl sulfoxide as the solvent, a base, and molecular oxygen as a green oxidant. This study provides a new catalytic route for the production of alkynyl sulfides through dual activation of S–S and C–H bonds. A wide range of alkynyl sulfides were synthesized on a large scale with a lowcatalystloading (0.5 mol%