Low-Valent Niobium-Mediated Double Activation of C−F/C−H Bonds: Fluorene Synthesis from o-Arylated α,α,α-Trifluorotoluene Derivatives
摘要:
By the treatment of 0.3 molar amount of NbCl5 and LiAlH4, o-arylated alpha,alpha,alpha-trifluorotoluenes afforded fluorene derivatives in good yields. C-F bonds of the CF3 group and the neighboring ortho C-H bond were doubly activated to give the coupling products.
Herein, we described the selective synthesis of both alkylated and alkenylated fluorenes using a single SNS ligand derived nickel complex. The protocol was employed for a wide range of substrates, including substituted fluorenes and various alcohols including aliphaticalcohols with a distal double bond. To expand the synthetic utility, an antimalarial drug analogue, benflumetol, was synthesized, and
Low-Valent Niobium-Mediated Double Activation of C−F/C−H Bonds: Fluorene Synthesis from <i>o</i>-Arylated α,α,α-Trifluorotoluene Derivatives
作者:Kohei Fuchibe、Takahiko Akiyama
DOI:10.1021/ja0565323
日期:2006.2.1
By the treatment of 0.3 molar amount of NbCl5 and LiAlH4, o-arylated alpha,alpha,alpha-trifluorotoluenes afforded fluorene derivatives in good yields. C-F bonds of the CF3 group and the neighboring ortho C-H bond were doubly activated to give the coupling products.
Manganese catalyzed switchable <i>C</i>-alkylation/alkenylation of fluorenes and indene with alcohols
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