A copper-catalyzed radical cross-coupling of oxime esters and activatedalkenes is accomplished for the synthesis of cyanoalkylsulfonylated oxindoles and cyanoalkyl amides via an aryl migration strategy. Specifically, the subsequent mechanism research indicates that the unique desulfonylation and sulfone addition processes were involved in the transformation. This transformation is identified as having
4 + 1 Radical annulations with isonitriles: a simple route to cyclopenta-fused quinolines
作者:Dennis P. Curran、Hui Liu
DOI:10.1021/ja00006a033
日期:1991.3
this first example of a 4+1 radical annulation includes the following: (1) radical addition to an isonitrile, (2) cyclization of the resulting imidoyl radical to the alkyne, (3) addition of the so-formed vinyl radical to the aromatic ring, and (4) rearomatization. When substituted isonitriles (p-F p-OMe, m-F) are employed, the major unrearranged products are accompanied by 7-30% or rearranged products
1-取代的 5-碘-1-戊炔、5 当量的苯基异氰化物和 1.5 当量的六甲基二锡在 150 o C 的叔丁基苯 (0.01-0.025 M) 中的太阳灯照射产生 9-取代的 2,3-二氢-1H -cyclopenta [b] 喹啉的产率为 36-70%。4+1 自由基环化的第一个例子的机制建议包括以下内容:(1) 自由基加成到异腈,(2) 所得亚胺酰基自由基环化到炔烃上,(3) 加成如此形成的乙烯基芳环上的自由基,和(4)重构化。当使用取代的异腈(pF p-OMe,mF)时,主要的未重排产物伴随有 7-30% 或重排产物。提出的中间体的独立生成表明,重排产物是通过乙烯基自由基的初始闭合形成五元环而产生的,
Intermolecular Photocatalyzed Heck-like Coupling of Unactivated Alkyl Bromides by a Dinuclear Gold Complex
作者:Jin Xie、Jian Li、Vanessa Weingand、Matthias Rudolph、A. Stephen K. Hashmi
DOI:10.1002/chem.201602939
日期:2016.8.26
A practical protocol for a photocatalyzed alkyl‐Heck‐like reaction of unactivated alkyl bromides and different alkenes promoted by dinuclear gold photoredox catalysis in the presence of an inorganic base is reported. Primary, secondary, and tertiary unactivated alkyl bromides with β‐hydrogen can be applied. Esters, aldehydes, ketones, nitriles, alcohols, heterocycles, alkynes, alkenes, ethers, and
Iron‐Mediated Cyanoalkylsulfonylation/Arylation of Active Alkenes with Cycloketone Oxime Derivatives via Sulfur Dioxide Insertion
作者:Zan Chen、Quan Zhou、Qiao‐Lin Wang、Pu Chen、Bi‐Quan Xiong、Yun Liang、Ke‐Wen Tang、Yu Liu
DOI:10.1002/adsc.202000369
日期:2020.7.29
Iron‐mediated radical cyanoalkylsulfonylation/arylation of active olefins with cycloketone oxime derivatives via cleavage of C−C single bond and insertion of SO2 is developed for the preparation of cyanoalkylsulfonylated oxindoles. This difunctionalization of carbon−carbon double bond via a radical pathway involves cyclobutanone oxime ester fragmentation, sulfonyl radical generation and radical addition/5‐exo
Copper‐Catalyzed Intermolecular Heck‐Like Coupling of Cyclobutanone Oximes Initiated by Selective C−C Bond Cleavage
作者:Binlin Zhao、Zhuangzhi Shi
DOI:10.1002/anie.201707181
日期:2017.10.2
The first example of intermolecular olefination of cyclobutanone oximes with alkenes via selective C−C bond cleavage leading to the synthesis of nitriles in the presence of a cheap copper catalyst is reported. The procedure is distinguished by mild and safe reaction conditions that avoid ligand, oxidant, base, or toxic cyanide salt. A wide scope of cyclobutanones and olefin coupling components can