with trifluoroacetylated acetylenes was investigated. It was found that the reaction of various pyridines with two molecules of CF3CO-acetylenes proceeds under mild metal-free conditions. As a result, efficient stereoselective synthesis of 3-arylethynyl-3-trifluoromethyl-1,3-oxazinopyridines was elaborated. Target heterocycles can be prepared in up to quantitative yields.
Diastereoselective synthesis of CF<sub>3</sub>-oxazinoquinolines in water
作者:Vasiliy M. Muzalevskiy、Kseniya V. Belyaeva、Boris A. Trofimov、Valentine G. Nenajdenko
DOI:10.1039/c9gc03044a
日期:——
A highly efficient stereoselective synthesis of CF3-oxazinoquinolines was elaborated using the reaction of CF3-ynones with quinolines in water. It was demonstrated that under these green conditions, the reaction proceeds up to 20 times faster to provide target compounds in almost quantitative yields. Moreover, this method is devoid of any chromatographic purification to give CF3-oxazinoquinolines with
Organometal-Free Arylation and Arylation/Trifluoroacetylation of Quinolines by Their Reaction with CF<sub>3</sub>-ynones and Base-Induced Rearrangement
作者:Vasiliy M. Muzalevskiy、Kseniya V. Belyaeva、Boris A. Trofimov、Valentine G. Nenajdenko
DOI:10.1021/acs.joc.0c01277
日期:2020.8.7
The reaction of quinolines with CF3-ynones resulted in the formation of 1,3-oxazinoquinolines. Subsequent treatment of the reaction mixture with a base initiated deep structural transformation of primary products. Both steps proceed in very high yield. As a result, unusual rearrangement of 1,3-oxazinoquinolines to form either 2-arylquinolines or 2-aryl-3-trifluoroacetylquinolines was discovered. The
Synthesis of Polysubstituted Trifluoromethylpyridines from Trifluoromethyl-α,β<i>-</i>ynones
作者:Tianyu Yang、Zhoubin Deng、Ke-Hu Wang、Pengfei Li、Danfeng Huang、Yingpeng Su、Yulai Hu
DOI:10.1021/acs.joc.9b02873
日期:2020.1.17
trifluoromethylpyridine derivatives by the Bohlmann-Rahtz heteroannulation reaction is described, which use trifluoromethyl-α,β-ynones as trifluoromethyl building blocks to react with β-enamino esters or β-enamino ketones in the presence of ZnBr2 to form the trifluoromethylpyridine derivatives in good yields. The protocol has the advantages of readily available starting materials, mild reaction conditions, and
Metal-free stereoselective annulation of quinolines with trifluoroacetylacetylenes and water: an access to fluorinated oxazinoquinolines
作者:B. A. Trofimov、K. V. Belyaeva、L. P. Nikitina、A. V. Afonin、A. V. Vashchenko、V. M. Muzalevskiy、V. G. Nenajdenko
DOI:10.1039/c7cc09725e
日期:——
Metal-free reaction between quinolines, aryltrifluoroacetylacetylenes and water at −18 °C–rt in MeCN resulted in stereoselective assembly of trifluoromethylated oxazinoquinolines with up to 99% yield that was essentially in contrast to a similar reaction with pyridines. The annulation proceeded via the 1,3-dipolar adducts of quinolines with trifluoroacetylacetylenes followed by intramolecular cyclization