New approaches to pyrimido[4,3-b][1,3,5]selenadiazines
作者:K. A. Frolov、V. V. Dotsenko、S. G. Krivokolysko
DOI:10.1007/s11172-012-0051-4
日期:2012.2
es with primary amines and formaldehyde gave 3,7-disubstituted 8-R-3,4,7,8-tetrahydro-2H,6H-pyrimido[4,3-b]-[1,3,5]selenadiazine-9-carbonitriles. Alternatively, these compounds can be obtained by reactions of 4-R-2,6-diamino-4H-selenopyran-3,5-dicarbonitriles with primary amines and form-aldehyde or by multicomponent condensation of an appropriate aldehyde, cyanoselenoacet-amide, a primary amine, and