Visible-Light Photoredox Catalyzed Double C–H Functionalization: Radical Cascade Cyclization of Ethers with Benzimidazole-Based Cyanamides
作者:Si Jiang、Xiao-Jing Tian、Shu-Yao Feng、Jiang-Sheng Li、Zhi-Wei Li、Cui-Hong Lu、Chao-Jun Li、Wei-Dong Liu
DOI:10.1021/acs.orglett.0c03853
日期:2021.2.5
simple ethers with cyanamides is developed at roomtemperature. This strategy involves sequential inert Csp3-H/Csp2-H functionalizations through intermolecular addition reaction of oxyalkyl radicals to N-cyano groups followed by radical cyclization of iminyl radicals in situ generated with C-2 aryl rings. This method allows for efficient synthesis of tetracyclic benzo[4,5]imidazo[1,2-c]quinazolines. Importantly
在室温下开发了一种简单的醚与氰胺的可见光光氧化还原催化的自由基级联环化反应。该策略涉及通过氧烷基自由基与N-氰基的分子间加成反应,随后通过C-2芳基环原位产生的亚氨基自由基的自由基环化,依次进行惰性C sp3- H / C sp2- H官能化。该方法可以有效合成四环苯并[4,5]咪唑并[1,2- c ]喹唑啉。重要的是,这是氰酰胺分子间-分子间自由基级联环化反应的第一个例子。
Photocatalytic decarboxylative alkenylation of α-amino and α-hydroxy acid-derived redox active esters by NaI/PPh<sub>3</sub> catalysis
作者:Ya-Ting Wang、Ming-Chen Fu、Bin Zhao、Rui Shang、Yao Fu
DOI:10.1039/c9cc09654j
日期:——
Herein, we report the photocatalytic decarboxylative alkenylation reactions of N-(acyloxy)phthalimide derived from α-amino and α-hydroxy acids with 1,1-diarylethene, and with cinnamic acid derivatives through double decarboxylation, using sodium iodide and triphenylphosphine as redox catalysts. The reaction proceeds under mild irradiation conditions with visible blue light (440 nm or 456 nm) in an
Metal-free visible-light-promoted C(sp<sup>3</sup>)–H functionalization of aliphatic cyclic ethers using trace O<sub>2</sub>
作者:Ben Niu、Bryan G. Blackburn、Krishnakumar Sachidanandan、Maria Victoria Cooke、Sébastien Laulhé
DOI:10.1039/d1gc03482k
日期:——
Presented is a light-promoted C–C bond forming reaction yielding sulfone and phosphate derivatives at room temperature in the absence of metals or photoredox catalyst. This transformation proceeds in neat conditions through an auto-oxidationmechanism which is maintained through the leaching of trace amounts of O2 as sole green oxidant.
Metal–Organic Layers for Synergistic Lewis Acid and Photoredox Catalysis
作者:Yangjian Quan、Guangxu Lan、Yingjie Fan、Wenjie Shi、Eric You、Wenbin Lin
DOI:10.1021/jacs.9b12593
日期:2020.1.29
Metyrapone. The superior catalytic performance of Hf12-Ir-OTf over a mixture of photoredox catalyst and stoichiometric amounts of Brønstedacids or sub-stoichiometric amounts (20 mol%) of Lewis acids is attributed to the close proximity (1.2 nm) between photoredox and Lewis acid catalysts in Hf12-Ir-OTf, which not only facilitates the reaction between the carbon radical and the activated heteroarene but
Radikalische reaktionswege bei thermisch induzierten umsetzungen von zirconocenkomplexen
作者:G. Erker、F. Rosenfeldt
DOI:10.1016/0040-4020(82)85115-6
日期:1982.1
The formation of products 2, 3 and 4 (a–l) from both the reaction of η2-benzophenone zirconocene 1 with alkyl halides and the thermolysis of the α-(Cp2ZrCl)-substituted benzhydrylmethylether 9, the latter proceeding with anchimericassistance of the metal, can be understood assuming a stepwise reaction path through radical intermediates. The proposed intermediate transition-metal benzophenone ketyl