合成了一系列通式 [(η 6 -arene)RuCp][PF 6 ](其中芳烃 = 芳基卤化物或硝基芳烃)的配合物,发现芳烃环对分子间亲核芳族取代(S N Ar) 与一系列环状 1,3-二酮反应。竞争实验表明芳基卤化物和硝基芳烃的离去基团能力依次为F ≫ NO 2 > Cl > Br。在 S N Ar 之后,芳烃环通过快速光解反应(<15 分钟)定量释放。
The organocatalytic enantio- and diastereoselective cycloetherification of 1,3-cyclohexanedione-bearing enones involving the in situ generation of chiral cyanohydrins was developed. This transformation offers the first catalytic asymmetric approach to oxadecalin derivatives containing contiguous tetrasubstituted chiral carbons at the bridge heads of the fused ring systems. Depending on substituents
Catalytic 1,4-Rhodium(III) Migration Enables 1,3-Enynes to Function as One-Carbon Oxidative Annulation Partners in CH Functionalizations
作者:David J. Burns、Hon Wai Lam
DOI:10.1002/anie.201406072
日期:2014.9.8
1,3‐Enynes containing allylic hydrogens cis to the alkyne are shown to act as one‐carbon partners, rather than two‐carbon partners, in various rhodium‐catalyzedoxidativeannulations. The mechanism of these unexpected transformations is proposed to occur through double CH activation, involving a hitherto rare example of the 1,4‐migration of a RhIII species. This phenomenon is general across a variety
Functionalization of C sp 3H and C sp 2H Bonds: Synthesis of Spiroindenes by Enolate-Directed Ruthenium-Catalyzed Oxidative Annulation of Alkynes with 2-Aryl-1,3-dicarbonyl Compounds
作者:Suresh Reddy Chidipudi、Imtiaz Khan、Hon Wai Lam
DOI:10.1002/anie.201207170
日期:2012.11.26
Ru(de) awakening: The synthesis of carbocycles by the ruthenium‐catalyzedoxidativeannulation of alkynes with 2‐aryl cyclic 1,3‐dicarbonyl substrates is described. Proceeding by the functionalization of CH and CH bonds, and the formation of an all‐carbon quaternary center, the reaction provides a diverse range of spiroindenes in good yields with high levels of regioselectivity.
Photoredox‐Catalyzed Isomerization of Highly Substituted Allylic Alcohols by C−H Bond Activation
作者:Kai Guo、Zhongchao Zhang、Anding Li、Yuanhe Li、Jun Huang、Zhen Yang
DOI:10.1002/anie.202000743
日期:2020.7.6
Photoredox‐catalyzed isomerization of γ‐carbonyl‐substituted allylicalcohols to their corresponding carbonyl compounds was achieved for the first time by C−H bond activation. This catalytic redox‐neutral process resulted in the synthesis of 1,4‐dicarbonyl compounds. Notably, allylicalcohols bearing tetrasubstituted olefins can also be transformed into their corresponding carbonyl compounds. Density