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.