Silica-supported silver nanoparticles as an efficient catalyst for aromatic C–H alkylation and fluoroalkylation
作者:Mikhail N. Khrizanforov、Svetlana V. Fedorenko、Asiya R. Mustafina、Kirill V. Kholin、Irek R. Nizameev、Sofia O. Strekalova、Valeriya V. Grinenko、Tatiana V. Gryaznova、Rustem R. Zairov、Raffaello Mazzaro、Vittorio Morandi、Alberto Vomiero、Yulia H. Budnikova
DOI:10.1039/c8dt01090k
日期:——
temperature under nanoheterogeneous electrochemical conditions. Negligible oxidative leaching of silver from Ag0/+@SiO2 is recorded during the catalytic coupling of arenes with acetic, difluoroacetic and trifluoroacetic acids, which enables the good recyclability of the catalytic function of the Ag0/+@SiO2 nanostructure. The catalyst can be easily separated from the reaction mixture and reused a minimum of
Fe and Ni-catalyzed electrochemical perfluoroalkylation of C—H bonds of coumarins
作者:M. N. Khrizanforov、S. O. Strekalova、V. V. Grinenko、V. V. Khrizanforova、T. V. Gryaznova、Yu. H. Budnikova
DOI:10.1007/s11172-017-1906-5
日期:2017.8
A new method for the preparation of perfluoroalkylcoumarins in a single step is developed. The compounds are prepared via electrocatalytic reduction of a 1 : 1 mixture of an aromatic compound (coumarin, 6-methylcoumarin, and 7-methylcoumarin) and a fluoroalkylating reagent under mild conditions (room temperature, normal pressure) using [bipyFeII] or [bipyNiII] complexes as catalysts. The developed
Mn(OAc)3-mediated direct Csp2-H radical trifluoromethylation of coumarins with CF3SO2Na (Langlois reagent) to afford selective 3-trifluoromethyl coumarins in moderate to good yields is described. This methodology can also be applied to the trifluoromethylation of quinolinones and pyrimidinones.