Phosphine-Mediated Redox Cyclization of 1-(2-Nitroaryl)prop-2-ynones to 3-Hydroxyquinolin-4-ones: Formal Intramolecular Oxyamination of α,β-Ynones
作者:Lona Dutta、S. S. V. Ramasastry
DOI:10.1021/acs.orglett.2c03232
日期:2022.10.21
hamper the generality and practicality. Here, we describe phosphine-mediated redox transformation of easily accessible 1-(2-nitroaryl)prop-2-ynones to 3HQs. Besides establishing a new entry to the synthesis of 3HQs under neutral conditions, this method is the first formal intramolecular oxyamination of α,β-ynones. The synthetic utility of this method is demonstrated in the total synthesis of japonine
3-羟基喹啉-4(1 H )-酮 (3HQ) 是特殊的结构基序。目前的合成方法需要强酸性或强碱性条件,这限制了其通用性和实用性。在这里,我们描述了磷化氢介导的氧化还原将容易获得的 1-(2-硝基芳基)丙-2-炔酮转化为 3HQ。该方法除了为中性条件下3HQ的合成开辟了新的途径外,也是α,β-炔酮的第一个正式的分子内氧胺化反应。该方法的合成效用在 japonine、其类似物和稀有喹啉衍生物的全合成中得到了证明。