Recyclization of 2,6-Diamino-4-aryl(cyclohexyl)-3,5-dicyano-4H-thio(seleno)pyrans
作者:V. D. Dyachenko、A. N. Chernega、S. G. Garasevich
DOI:10.1007/s11176-005-0475-8
日期:2005.10
Recyclization of 2,6-diamino-4-aryl(cyclohexyl)-3,5-dicyano-4H-thio(seleno)pyrans in the presence of an equimolar amount of an α-bromo carbonyl compound, ethyl iodide, 1,2-dibromoethane, or 3-chlorophenyl isocyanate yields, respectively, 3-aryl(cyclohexyl)-2-[thiazol(selenazol)-2-yl]acrylonitriles, 6-amino-4-phenyl-2-ethylsulfanyl-1,4-dihydropyridine-3,5-dicarbonitrile, 5-amino-7-phenyl-2,3,4,7-tetrahydrothiazolo[3,2-a]pyridine-6,8-dicarbonitrile, or N,N′-bis(3-chlorophenyl)urea.
2,6-二氨基-4-芳基(环己基)-3,5-二氰基-4H-硫(硒)吡喃的再环化在等摩尔的α-溴羰基化合物、乙基碘、1,2-二溴乙烷或3-氯苯异氰酸酯存在下,分别生成3-芳基(环己基)-2-[噻唑(硒唑)-2-基]丙烯腈、6-氨基-4-苯基-2-乙基硫醇-1,4-二氢吡啶-3,5-二氰基、5-氨基-7-苯基-2,3,4,7-四氢噻唑[3,2-a]吡啶-6,8-二氰基或N,N′-双(3-氯苯)尿素。