Novel [4 + 2] Cycloaddition Reaction of Aryl-Methylidenemalononitriles to Unsaturated Chalcogen Amides. Synthesis, Structure, and Properties of Triethylammonium 3,5,5-Tricyano-1,4,5,6-Tetrahydropyridine-2-Selenolates and -Thiolates
作者:K. A. Frolov、V. V. Dotsenko、S. G. Krivokolysko、E. O. Kostyrko
DOI:10.1007/s10593-013-1378-y
日期:2013.12
Reaction of arylmethylidenemalononitriles with 3-aryl-2-cyanoprop-2-eneselenoamides in the presence of Et3N gave triethylammonium 4,6-diaryl-3,5,5-tricyano-1,4,5,6-tetrahydropyridine-2-selenolates. A similar reaction with cyclohexylidenecyanothioacetamide yields triethylammonium 4-aryl-1,5,5-tri-cyano-3-azaspiro[5.5]undec-1-ene-2-thiolate. Alkylation of the obtained selenolates and thiolates gives 6-(alkylseleno)-2,4-diaryl-1,4-dihydropyridine-3,3,5(2H)-tricarbonitriles and 4-(alkylthio)-2-aryl-3-aza- spiro[5.5]undec-4-ene-1,1,5-tricarbonitriles, respectivelly. The structure of 2,4-di(2-furyl)-6-[2-(4-methylphenyl)-2-oxoethyl]seleno}-1,4-dihydropyridine-3,3,5(2H)-tricarbonitrile has been confirmed by the X-ray structural analysis.