Transition-Metal-Free Intramolecular Ullmann-Type O-Arylation: Synthesis of Chromone Derivatives
作者:Jie Zhao、Yufen Zhao、Hua Fu
DOI:10.1002/anie.201007302
日期:2011.4.11
Expect the upexpected: A transition‐metal‐free approach to access chromone derivatives has been developed. The intramolecular O‐arylation of substituted 1‐(2‐haloaryl)‐propane‐1,3‐diones in DMF in the presence of K2CO3 gave the corresponding target products in good to excellent yields (see scheme; DMF=N,N′‐dimethylformamide).
期望超出预期:已开发出一种无过渡金属的方法来获取色酮衍生物。在存在K 2 CO 3的情况下,在DMF中进行取代的1-(2-卤代芳基)-丙烷-1,3-二酮的分子内O-芳基化反应,相应的目标产物收率良好至优异(参见方案; DMF = N,N'-二甲基甲酰胺)。
Copper-catalyzed TEMPO oxidative cleavage of 1,3-diketones and β-keto esters for the synthesis of 1,2-diketones and α-keto esters
作者:Peng-Jun Zhou、Cheng-Kun Li、Shao-Fang Zhou、Adedamola Shoberu、Jian-Ping Zou
DOI:10.1039/c7ob00241f
日期:——
A copper-catalyzed efficient and practical method has been developed for the synthesis of 1,2-diketones and α-keto esters. TEMPO was used as a radical initiator and scavenger, oxidizing the cleavage of α-methylene of 1,3-diketones and β-keto esters to form 1,2-diketones and α-keto esters. This method provided a general way for the formation of 1,2-dicarbonyl compounds.
A novel tandem synthesis of β-keto enolethers was developed via the reaction of α-diazoketones, 1,3-diketones and THF catalyzed by cheap and available CuI under extremely simple conditions. During the course of the reaction, the ring-opened THF and diazocarbonyl derived carbene simultaneously inserted into O-H of 1,3-diketones.
Blue Light‐Promoted Reaction of
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‐Diazoketones and Sulfoxonium Ylides: Synthesis of 1,3‐Dicarbonyl Sulfoxonium Ylides
作者:Yirong Dong、Yu Tian、Zunting Zhang、Tao Wang
DOI:10.1002/adsc.202200944
日期:2022.12.8
We report a strategy for the preparation of 1,3-dicarbonyl sulfoxonium ylides from α-diazoketones and sulfoxonium ylides. The transformation is achieved based on the blue-LEDs-promoted Wolff rearrangement of the α-diazoketones, and the nucleophilic nature of the sulfoxonium ylides. A large array of products was prepared to demonstrate the substrate scope and functional group tolerance. A plausible
我们报告了从 α-重氮酮和氧化亚砜叶立德制备 1,3-二羰基氧化亚砜叶立德的策略。这种转变是基于蓝色 LED 促进的 α-重氮酮的 Wolff 重排和氧化亚硝叶立德的亲核性质实现的。准备了大量的产品来展示底物范围和官能团耐受性。根据实验结果,为这种转变提出了一种似是而非的机制。此外,探索了产品的合成效用。