The syntheses of rhodium, iridium, and iron π complexes bearing 4,5-benzotropone ligands are reported. X-ray crystallographic analyses revealed that a tropone core coordinates to a metal center in a η4 manner with a tub-form geometry. Some of the benzotropone π complexes exhibited catalyticactivity for N-alkylation of aniline by borrowing hydrogen.
Nickel-catalyzed skeletal transformation of tropone derivatives <i>via</i> C–C bond activation: catalyst-controlled access to diverse ring systems
作者:Takuya Kodama、Kanako Saito、Mamoru Tobisu
DOI:10.1039/d2sc01394k
日期:——
We report herein on nickel-catalyzed carbon–carbon bondcleavage reactions of 2,4,6-cycloheptatrien-1-one (tropone) derivatives. When a Ni/N-heterocycliccarbene catalyst is used, decarbonylation proceeds with the formation of a benzene ring, while the use of bidentate ligands in conjunction with an alcohol additive results in a two-carbon ring contraction with the generation of cyclopentadiene derivatives
我们在此报告了镍催化的 2,4,6-环庚三烯-1-酮(托品酮)衍生物的碳-碳键断裂反应。当使用Ni/N-杂环卡宾催化剂时,脱羰作用会随着苯环的形成而进行,而使用二齿配体与醇添加剂结合会导致双碳环收缩,并生成环戊二烯衍生物。后一个反应涉及镍-乙烯酮络合物作为中间体,并通过 X 射线晶体学对其进行了表征。选择合适的配体可以通过七元碳环骨架的裂解选择性合成四种不同的产物。还通过计算研究了两种类型的环收缩反应的反应机制和配体控制的选择性。
Molecular design by cycloaddition reactions. XXV. High peri- and regiospecificity of phencyclone