Development of a Suzuki Cross-Coupling Reaction between 2-Azidoarylboronic Pinacolate Esters and Vinyl Triflates To Enable the Synthesis of [2,3]-Fused Indole Heterocycles
作者:Navendu Jana、Quyen Nguyen、Tom G. Driver
DOI:10.1021/jo500252e
日期:2014.3.21
The scope and limitations of a Suzukireaction between 2-azidoarylboronic acid pinacolate esters and vinyl triflates are reported. This cross-couplingreaction enables the regioselective synthesis of indoles after a subsequent RhII2-catalyzed sp2-C–H bond amination reaction.
Rhodium-Catalyzed CS and CN Functionalization of Arenes: Combination of CH Activation and Hypervalent Iodine Chemistry
作者:Fen Wang、Xinzhang Yu、Zisong Qi、Xingwei Li
DOI:10.1002/chem.201504179
日期:2016.1.11
Rhodium‐catalyzed sulfonylation, thioetherification, thiocyanation, and other heterofunctionalizations of arenes bearing a heterocyclic directing group have been realized. The reaction proceeds by initial RhIII‐catalyzed CH hyperiodination of arene at room temperature followed by uncatalyzed nucleophilic functionalization. A diaryliodonium salt is isolated as an intermediate, which represents umpolung
Rh<sup>II</sup><sub>2</sub>-Catalyzed Synthesis of α-, β-, or δ-Carbolines from Aryl Azides
作者:Ashley L. Pumphrey、Huijun Dong、Tom G. Driver
DOI:10.1002/anie.201201788
日期:2012.6.11
isomers: A range of α‐, β‐ and δ‐carbolinium ions are readily available from ortho‐substituted arylazides using a rhodium(II) carboxylate catalyst (see scheme). The carbolinium ions are readily reduced to afford tryptolines or deprotonated to access pyridoindoles. This [RhII2]‐catalyzed CH bond amination was used in the synthesis of (±)‐horsfiline and neocryptolepine. esp=α,α,α′,α′‐ tetramethyl‐1,3
接近所有异构体:使用羧酸铑 (II) 催化剂可从邻位取代芳基叠氮化物中轻松获得一系列 α-、β- 和 δ-咔啉鎓离子(参见方案)。咔啉离子很容易被还原以提供色氨酸或去质子化以获取吡啶并吲哚。这种 [Rh II 2 ]-催化的 C H 键胺化用于合成 (±)-horsfiline 和新隐碱。esp=α,α,α',α'-四甲基-1,3-苯二丙酸酯。
Gold-Catalyzed β-Regioselective Formal [3 + 2] Cycloaddition of Ynamides with Pyrido[1,2-<i>b</i>]indazoles: Reaction Development and Mechanistic Insights
Here, we report an unprecedented gold(I)-induced β-site regioselective formal [3 + 2] cycloaddition of ynamides with pyrido[1,2-b]indazoles, giving 3-amido-7-(pyrid-2′-yl)indoles in good to excellent yields. A complex of gold(I) catalyst with ynamide was isolated and characterized by X-ray diffraction analysis for the first time. Mechanistic investigations suggest the reaction pathway involves a gold-stabilized
在这里,我们报道了前所未有的金(I)诱导的酰胺与吡啶并[1,2- b ]吲唑的金(I)诱导的β位区域选择性形式[3 + 2]环加成反应,得到3-酰胺基7-(吡啶-2'-基吲哚具有良好的优良收率。首次分离了金(I)催化剂与乙酰胺的配合物,并首次通过X射线衍射分析对其进行了表征。机理研究表明,该反应途径涉及金稳定的碳正离子中间体,该中间体依次参与了苯环邻位的连续C–H键功能化。
Rhodium(III)-Catalyzed Azidation and Nitration of Arenes by CH Activation
作者:Fang Xie、Zisong Qi、Xingwei Li
DOI:10.1002/anie.201305902
日期:2013.11.4
nitrite served as readily available nitrogen sources, and pyridine, pyrimidine, and pyrazole substituents were efficient directing groups (DGs; see scheme; Cp*=C5Me5). The synthetic utility of the azidation products was demonstrated in subsequent functional‐group transformations.
掌握解决方案:在存在高价碘氧化剂的螯合辅助标题反应中,叠氮化钠和亚硝酸钠是易于获得的氮源,吡啶,嘧啶和吡唑取代基是有效的导向基团(DG;参见方案; Cp * = C 5 Me 5)。叠氮化产物的综合效用在随后的功能组转化中得到了证明。