Regio- and Stereoselective Radical Perfluoroalkyltriflation of Alkynes Using Phenyl(perfluoroalkyl)iodonium Triflates
作者:Xi Wang、Armido Studer
DOI:10.1021/acs.orglett.7b01215
日期:2017.6.2
A method for regio- and stereoselective anti-addition of the perfluoroalkyl and the triflate group of phenyl(perfluoroalkyl)iodonium triflates to alkynes is presented. The radical reaction uses cheap CuCl as a smart initiator and can be conducted in gram scale. The perfluoroalkyltriflated products are readily further functionalized, rendering this transformation valuable.
Photocatalytic Aerobic Oxysulfonylation of Alkynes to Access
<scp>β‐Keto</scp>
Sulfones Catalyzed by
<scp>
OVs‐N‐Nb
<sub>2</sub>
O
<sub>5</sub>
</scp>
作者:Tao Song、Yinpan Zhang、Chun Wang、Yafei Li、Yong Yang
DOI:10.1002/cjoc.202200410
日期:2022.11.15
photocatalyst for radical-mediated oxidative oxysulfonylation of alkynes to β-ketosulfones under environmentally benign conditions. The oxygen vacancy-rich semiconductor Nb2O5 (labeled as OVs-N-Nb2O5) could efficiently catalyze a wide range of alkynes, especially for those bearing electron-deficient substituents or internal alkynes, to their corresponding β-ketosulfones in good to high yields with good tolerance
在此,我们报道了一种新型多相光催化剂,用于在环境友好条件下自由基介导的炔烃氧化氧磺酰化为 β-酮砜。富含氧空位的半导体 Nb 2 O 5(标记为 OVs-N-Nb 2 O 5)可以有效地催化多种炔烃,尤其是那些带有缺电子取代基或内部炔烃的炔烃,生成相应的 β-酮砜在可见光照射下具有良好至高产率,并且对多种官能团具有良好的耐受性。通过该程序还实现了甾体化合物的后期修饰和生物活性分子的合成,突出了其实际应用的潜力。同时,光催化剂OVs-N-Nb2 O 5在连续循环中表现出出色的催化稳定性,而活性和选择性没有明显损失。通过对照实验和理论计算清楚地揭示了氧空位对提高反应活性和选择性的关键作用。
Rhodium‐Catalyzed Anti‐Markovnikov Transfer Hydroiodination of Terminal Alkynes**
作者:Philip Boehm、Niklas Kehl、Bill Morandi
DOI:10.1002/anie.202214071
日期:2023.1.23
We report a shuttle approach for the Rh-catalyzed anti-Markovnikov hydroiodination of terminalalkynes to vinyl iodides. For aliphatic alkynes, a ligand- and substrate-dependent stereodivergence is observable. The vinyl iodides are engaged in a variety of C−C and C−X bond-forming reactions. The method is used to shorten a synthetic sequence to a cis-fatty acid. Deuterium-labeling and stoichiometric