Crystal structures of (<i>E</i>)-2-amino-4-methylsulfanyl-6-oxo-1-(1-phenylethylideneamino)-1,6-dihydropyrimidine-5-carbonitrile and (<i>E</i>)-2-amino-4-methylsulfanyl-6-oxo-1-[1-(pyridin-2-yl)ethylideneamino]-1,6-dihydropyrimidine-5-carbonitrile

Abstract

The title compounds 3a , C 14 H 13 N 5 OS, and 3b , C 13 H 12 N 6 OS, both show an E configuration about the N=C bond and a planar NH 2 group. The molecules, which only differ in the presence of a phenyl (in 3a ) or pyridyl (in 3b ) substituent, are closely similar except for the different orientations of these groups. The amino hydrogen atoms form classical hydrogen bonds; in 3a the acceptors are the oxygen atom and the cyano nitrogen atom, leading to ribbons of molecules parallel to the b axis, whereas in 3b the acceptors are the oxygen atom and the pyridyl nitrogen, leading to a layer structure perpendicular to (\overline{1}01).

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