A copper-catalyzed aminooxylation of β-ketoesters using transient nitrosoformate intermediates is reported. The transformation is highly practical, efficient and highlights the ambident reactivity of nitrosocarbonyl compounds through a rare example of a nitrosocarbonyl aldol reaction. Along with a broad substrate scope, the reaction conditions that help control the regiochemistry are explored and the use of N-carbamate protected hydroxylamine is showcased by subsequent one-pot annulation reactions.
报道了一种
铜催化的β-
酮酯氨氧化,使用瞬态亚硝基
甲酸酯中间体。该转化过程实用、高效,并突出了亚硝基碳酰化合物的双重反应活性,通过一个罕见的亚硝基碳酰醇缩反应作为例证。除了广泛的底物范围之外,还探讨了有助于控制区域
化学的反应条件,并通过后续的一锅式环化反应展示了N-
氨甲基保护
羟胺的使用。