Nickel-catalyzed synthesis of 9-monoalkylated fluorenes from 9-fluorenone hydrazone and alcohols
作者:Jiang-Tao Fan、Xin-Heng Fan、Yong-Jie Chen、Cai-Yan Gao、Lian-Ming Yang
DOI:10.1080/00397911.2019.1647438
日期:——
Abstract A practical protocol was disclosed for the nickel-catalyzed C-alkylation of 9-fluorenone hydrazone with alcohols using t-BuOK as the base, and 9-monoalkylated fluorene derivatives were obtained in good yields under the benign conditions. GRAPHICAL ABSTRACT
Study on the Reactivity of Diarylmethane Derivatives in Supercritical Alcohols Media: Reduction of Diarylmethanols and Diaryl Ketones to Diarylmethanes Using Supercritical 2-Propanol
作者:Bunpei Hatano、Daisuke Kubo、Hideyuki Tagaya
DOI:10.1248/cpb.54.1304
日期:——
We found that diarylmethanols and diarylketones were smoothly reduced to the corresponding diarylalkanes using supercritical 2-propanol in good yields. Furthermore, we determined the specific reaction of fluorene using supercritical methanol at high temperature.
Starting from cyclic diaryliodoniums and terminal alkenes, a diverse set of fluorenes is conveniently constructed. The reactions catalyzed by palladium undergo one conventional Mizoroki‐Heckreaction and one reductive Heckreaction. The scope of alkenes is general, leading to 29 fluorenes which would expand the structural diversity of fluorene reservoir.
By using aldehydes or ketones as the catalyst and screening CsOH out as the more effective base than KOH in many instances, an efficient 9-C-alkylation of fluorenes with alcohols was...
central goal in catalysis. This would be especially interesting when the reactivity and selectivity patterns can be tuned. Herein, we introduced the first Mn-catalyzed selective C-alkylation and olefination of fluorene, and indene with alcohols. Various substrates including benzylic, heteroaromatic, and aliphatic primary and secondary alcohols are employed as alkylating agents. Mechanistic investigations