Substituted 2-amino-3-cyano-4H-pyrans represent important precursors in syntheses of condensed heterocycles containing a 4H-pyran nucleus. In the context of studies of reactivity of 2-amino-5-acetyl-4-(5-X-2-furyl)-3-cyano-6-methyl-4H-pyrans we were interested in the possibility of preparing 2-aryl(heteroaryl)methyleneamino-4H-pyrans III.
替代的2-
氨基-3-
氰基-4
H-
吡喃是合成含有4
H-
吡喃核的紧缩杂环的重要前体。在研究2-
氨基-5-乙酰基-4-(5-X-2-
呋喃基)-3-
氰基-6-甲基-4
H-
吡喃的反应性时,我们对制备2-芳基(杂环芳基)亚甲基
氨基-4
H-
吡喃
III的可能性感兴趣。