Formation of 4-hydroxy-5-[aryl(alkyl)-1H-pyrazol-4-yl]benzene-1,2-dicarbonitriles in reactions of benzofurans with hydrazines
摘要:
Some regularities are discussed of the reaction between 3-substituted benzofuran-5,6-dicarbonitriles with hydrazines leading to the formation of new 4-hydroxy-5-[aryl(alkyl)-1H-pyrazol-4-yl]-benzene-1,2-dicarbonitriles.
Synthesis of 5,6-dicyanobenzofurans based on 4-bromo-5-nitrophthalonitrile
摘要:
A new stereoselective method for the synthesis of substituted 5,6-dicyanobenzofurans by activated aromatic nucleophilic replacement of a bromine atom and a nitro group in 4-bromo-5-nitrophthalonitrile has been developed.
Reduction of 3-carbonyl-substituted 5,6-dicyanobenzofurans with sodium borohydride
作者:Zh. V. Chirkova、S. I. Filimonov、I. G. Abramov、S. I. Firgang、G. A. Stashina
DOI:10.1007/s11172-011-0256-y
日期:2011.8
AbstactReduction of 3-R-carbonyl-substituted 5,6-dicyanobenzofurans with sodiumborohydride was studied under various conditions. 3-R-Carbonyl-substituted 5,6-dicyanobenzofurans are selectively reduced in ethanol to substituted 3-R-(hydroxymethyl)-5,6-dicyano-2-methylbenzofurans, products of more deep reduction, viz., substituted 3-R-(hydroxymethyl)-2-methyl-2,3-dihydro-5,6-dicyanobenzofurans, 3-R-(hydroxymethyl)-5
Synthesis of formyl and carboxy derivatives of heterocycles by modification of 2-(2-aminovinyl)- benzofuran-5,6-dicarbonitriles
作者:Zh. V. Chirkova、S. I. Filimonov
DOI:10.1134/s1070428016090074
日期:2016.9
Procedures have been developed for the synthesis of 2-formylbenzofuran-5,6-dicarbonitriles, 5,6-dicyanobenzofuran-2-carboxylic acids, and formyldibenzo[b,d]furan-2,3-dicarbonitriles by modification of 2-(2-aminovinyl)benzofuran-5,6-dicarbonitriles with sodium periodate or Vilsmeier reagent.