Diversely Substituted Imidazo[1,2-<i>a</i>]pyrazine-8-oxo-3-carbaldehydes: An Iodine-Mediated Cyclization/Oxidation Approach
作者:Nigam M. Mishra、Dipak D. Vachhani、Sachin G. Modha、Erik V. Van der Eycken
DOI:10.1002/ejoc.201201150
日期:2013.2
and efficient iodine-mediated intramolecular heteroannulation approach for the construction of the imidazo[1,2-a]pyrazinone core has been developed. Under ambient conditions, this metal-free protocol allows easy access to densely functionalized imidazo[1,2-a]pyrazinone-3-carbaldehydes or (aminomethyl)imidazo[1,2-a]pyrazinones from substrates containing terminal alkynes by cyclization and subsequent
已经开发了一种温和有效的碘介导的分子内杂环化方法,用于构建咪唑并 [1,2-a] 吡嗪酮核。在环境条件下,这种不含金属的方案可以通过环化和后续从含有末端炔烃的底物轻松获得密集功能化的咪唑并[1,2-a]吡嗪酮-3-甲醛或(氨甲基)咪唑并[1,2-a]吡嗪酮氧化或胺化。通过在环化生成多取代的(二氢)咪唑并[1,2-a]吡嗪酮之后使用含有内部炔烃和/或Suzuki偶联的底物,可以引入进一步的多样化。