of cyclobutene fused with benzene and cyclohexene rings. In this paper, a direct method for synthesizing tetrahydrobiphenylenes based on a palladium (Pd)(0)-catalyzedC(sp2)-H functionalization was investigated. The developed method was applied to the synthesis of several tetrahydrobiphenylenes having an oxygen functionality at the ring juncture. The derivatization of a tetrahydrobiphenylene is also
Kinetics of the reactions of bissulfonylethylenes with various carbanions, a sulfur ylide, and siloxyalkenes have been investigated photometrically at 20 °C. The second‐order rate constants have been combined with the known nucleophile‐ specific parameters N and sN for the nucleophiles to calculate the empirical electrophilicity parameters E of bissulfonylethylenes according to the linear free energy
双磺酰基乙烯与各种碳负离子,硫叶立德和甲硅烷氧基烯烃的反应动力学已在20°C下进行了光度法研究。将二阶速率常数与亲核试剂的已知亲核试剂特定参数N和s N相结合,以根据线性自由能关系log k(20°C)= s N计算双磺酰基乙烯的经验亲电参数E(N + E)。讨论了结构-反应关系,并表明亲电参数E 这项工作中衍生的衍生物可用于定义双磺酰基乙烯作为Michael受体的合成潜力。
Oximinotrifluoromethylation of unactivated alkenes under ambient conditions
An oximinotrifluoromethylation of unactivated alkenes was developed via trifluoromethyl radical-induced intramolecular remote oximino migration under mild reaction conditions.
Halogenation of fluorinated cyclic 1,3-dicarbonyl compounds: new aspects of synthetic application
作者:Dmitri V. Sevenard、Mikhail Vorobyev、Vyacheslav Ya. Sosnovskikh、Helma Wessel、Olesya Kazakova、Vera Vogel、Nikolay E. Shevchenko、Valentine G. Nenajdenko、Enno Lork、Gerd-Volker Röschenthaler
DOI:10.1016/j.tet.2009.06.122
日期:2009.9
synthetic relevance of the polyhalogenated compounds obtained was demonstrated by the synthesis of several new heterocycles. An aromatization via a halogenation–dehydrohalogenation sequence proved to be a rewarding synthetic route to 2-(fluoroacyl)phenols and previously unknown 3-(fluoroacyl)thiochromones. The structure of one of the synthesized compounds was confirmed by X-ray diffraction analysis
Radical-Mediated 1,2-Formyl/Carbonyl Functionalization of Alkenes and Application to the Construction of Medium-Sized Rings
作者:Zhong-Liang Li、Xiao-Hua Li、Na Wang、Ning-Yuan Yang、Xin-Yuan Liu
DOI:10.1002/anie.201608198
日期:2016.11.21
A novel radical 1,2‐formylfunctionalization of alkenes involving 1,2(4,5)‐formyl migration triggered by addition of various carbon‐ and heteroatom‐centered radicals to alkenes has been developed for the first time, thus providing straightforward access to diverse β‐functionalized aldehydes with good efficiency, remarkable selectivity, and excellent functional group tolerance. Analogous transformations