金催化的β-区域选择性正式[3 + 2]酰胺与吡咯并[1,2- b ]吲唑的环加成反应:反应发展和机理研究
摘要:
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。
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。
Functionalizations of Aryl CH Bonds in 2-Arylpyridines via Sequential Borylation and Copper Catalysis
作者:Liting Niu、Haijun Yang、Daoshan Yang、Hua Fu
DOI:10.1002/adsc.201100930
日期:2012.8.13
sequential borylation and aerobic oxidative copper catalysis, and the corresponding aryl halides, sulfones, azides and arylamines were obtained in good yields. The protocol uses cheap and readily available boron tribromide (BBr3) as the borylating reagent, and inorganic salts (potassium iodide, ammonium bromide, sodium alkylsulfinates, sodium azide) as the functional group sources. This method makes