Reactions of Imidoyl Isoselenocyanates with Aromatic 2-Amino N-Heterocycles and 1-Methyl-1H-imidazole

摘要

The reaction of N-phenylimidoyl isoselenocyanates 1 with 2-amino-1,3-thiazoles 10 in acetone proceeded smoothly at room temperature to give 4H-1,3-thiazolo[3,2-a] [1,3,5]triazine-4-selones 13 in fair yields (Scheme 2). Under the same conditions, 1 and 2-amino-3-methylpyridine (11) underwent an addition reaction, followed by a spontaneous oxidation, to yield the 3H-4λ4-[1,2,4]selenadiazolo[1′,5′:1,5] [1,2,4]selenadiazolo[2,3-a]pyridine 14 (Scheme 3). The structure of 14 was established by X-ray crystallography (Fig. 1). Finally, the reaction of 1-methyl-1H-imidazole (12) and 1 led to 3-methyl-1-(N-phenylbenzimidoyl)-1H-imidazolium selenocyanates 15 (Scheme 4). In all three cases, an initially formed selenourea derivative is proposed as an intermediate.