seen as precursors of various heterocyclic rings. Although γ-amino-ynones have been used to prepare exocyclic vinylogous amides in the presence of Bronsted acids, we describe here the use of zinc chloride as a weak Lewis acid for their conversion into acetylenic cyclic imines. This reaction, which was attempted for a diverse range of γ-amino-ynones, proved to be robust and efficient in most cases and
氨基炔酮可被视为各种杂环的前体。尽管 γ-
氨基-炔酮已被用于在布朗斯台德酸存在下制备环外
乙烯基酰胺,但我们在此描述了使用
氯化锌作为弱
路易斯酸将其转化为炔环
亚胺。该反应尝试用于多种 γ-
氨基-炔酮,在大多数情况下被证明是稳健和有效的,并且很容易扩展到 δ-
氨基-炔酮以产生各种炔环
亚胺。根据后处理程序,后一种化合物可以作为游离有机化合物或
锌配合物分离。还报道了这些环状
亚胺与
钯形成配合物的能力。