Synthesis of 2-(polyfluoromethyl)pyrimido-[1,2-a]benzimidazole-4-carbaldehyde derivatives
作者:Danila V. Belyaev、Dmitrii L. Chizhov、Mikhail I. Kodess、Marina A. Ezhikova、Gennady L. Rusinov、Valery N. Charushin
DOI:10.1016/j.mencom.2019.05.002
日期:2019.5
A simple and efficient synthesis of 2-RF-pyrimido[1,2-a]benzimidazole-4-carbaldehyde derivatives comprises the reaction between 3-(polyfluoroacetyl)pyruvaldehyde dimethyl acetals and 2-aminobenzimidazole. The effects of fluorinated substituents in 3-(polyfluoroacetyl)pyruvaldehyde dimethyl acetals and the reaction conditions on regiochemical outcome of this reaction have been estimated.
Synthesis of 2-Substituted 6-(Polyfluoromethyl)pyrimidine-4-carbaldehyde Acetals
作者:D. V. Belyaev、D. L. Chizhov、G. L. Rusinov、V. N. Charushin
DOI:10.1134/s1070428019060204
日期:2019.6
Heterocyclization of 5,5-difluoro- and 5,5,5-trifluoro-2,4-dioxopentanal dimethyl acetals with amidines in the presence of 4 equiv of triethyl borate afforded 2-substituted 6-(difluoromethyl)- and 6-(trifluoromethyl)pyrimidine-4-carbaldehyde dimethyl acetals in high yields.
Efficient and scalable synthesis of 3-(polyfluoroacyl)pyruvaldehydes dimethyl acetals: A novel functionalized fluorinated building-block
作者:Dmitrii L. Chizhov、Danila V. Belyaev、Danil S. Yachevskii、Gennady L. Rusinov、Oleg N. Chupakhin、Valery N. Charushin
DOI:10.1016/j.jfluchem.2017.04.009
日期:2017.7
An efficient approach for the synthesis of 3-(polyfluoroacyl)pyruvaldehydes dimethyl acetals (1,1-dimethoxy-4-polyfluoroalkyl-butan-2,4-dions) from 1,1-dimethoxyacetone and polyfluorinated carboxylic acid esters has been developed. The procedure includes the Claisen type condensation of the starting materials by means of calcium hydride in methanol, followed by isolation of copper complexes of the