报道了在氧化条件下使用(二乙酰氧基碘)苯和K 2 S 2 O 8的组合,从N-吡啶基吲哚空前合成稠合的喹唑啉酮的报道。该反应是无金属的,具有广泛的底物范围,操作简单且反应时间短,并且以中等至高产率提供了11 H-吡啶并[2,1 - b ]喹唑啉-11酮衍生物。据信它是通过原位生成的2-羟基-1-(吡啶-2-基)吲哚-3-酮作为关键反应中间体进行的,该中间体经历CC键裂解产生亲电C-3位点在N-吡啶基吲哚中。吡啶氮随后的亲核攻击导致其环化。
Tandem Rh(III)-Catalyzed C–H Amination/Annulation Reactions: Synthesis of Indoloquinoline Derivatives in Water
作者:Liangliang Shi、Baiquan Wang
DOI:10.1021/acs.orglett.6b01234
日期:2016.6.17
Rh(III)-catalyzed synthetic method for indoloquinoline derivatives from readily available indoles and isoxazoles was developed. This annulation procedure undergoes tandem C–H activation, cyclization, and condensation steps. In this domino cyclization reaction, water is an efficient solvent. A catalytically competent five-membered rhodacycle has been isolated and characterized, thus revealing a key intermediate
Synthesis and Photophysical Study of Heteropolycyclic and Carbazole Motif: Nickel-Catalyzed Chelate-Assisted Cascade C–H Activations/Annulations
作者:Namrata Prusty、Shyam Kumar Banjare、Smruti Ranjan Mohanty、Tanmayee Nanda、Komal Yadav、Ponneri C. Ravikumar
DOI:10.1021/acs.orglett.1c03234
日期:2021.12.3
through sequential C–H bond activations has been described. Regioselective indole C2/C3 functionalization has been achieved in the presence of indole C7-H, which is quite challenging. In addition, this approach also gives easy access to building a heteropolycyclic motif through C6/C7 C–H functionalization of indoline. This methodology is not limited to aromatic internalalkynes as coupling partners; aliphatic
Ir(I)‐Catalyzed C−H Glycosylation for Synthesis of 2‐Indolyl‐
<i>C</i>
‐Deoxyglycosides
作者:Changyue Yu、Yichu Liu、Xiong Xie、Shulei Hu、Shurui Zhang、Mingjie Zeng、Dan Zhang、Jiang Wang、Hong Liu
DOI:10.1002/adsc.202100855
日期:2021.11.9
we present an efficient, regioselective, stereoselective and widely applicable strategy for the synthesis of 2-indolyl-C-deoxyglycosides via Ir(I)-catalyzed, pyridine-group-directed C−H functionalization. This method exhibits high tolerance for the functional groups of indoles and the protecting groups of carbohydrates. Moreover, this protocol has good stereoselectivity and mainly produces β-configuration
Cp*Co<sup>III</sup>-Catalyzed Synthesis of Pyrido[2′,1′:2,3]pyrimido[1,6-<i>a</i>]indol-5-iums via Tandem C–H Activation and Subsequent Annulation from 1-(Pyridin-2-yl)-1<i>H</i>-indoles and Internal Alkynes
作者:Yuhan Yang、Bo Li、Wenmin Liu、Rumeng Zhang、Lintao Yu、Qin-Ge Ma、Rongrong Lv、Donghua Du、Ting Li
DOI:10.1021/acs.joc.6b02314
日期:2016.11.18
of 1-(pyridin-2-yl)-1H-indoles with internal alkynes to afford pyrido[2′,1′:2,3]pyrimido[1,6-a]indol-5-iums is presented. Moreover, 6,7-dihydro-4H-pyrido[2′,1′:2,3]pyrimido[1,6-a]indole, a new functionalized N-fused indole core heterocycle, could be constructed effectively via reduction of pyrido[2′,1′:2,3]pyrimido[1,6-a]indol-5-ium by NaBH4.
Cp * Co III催化的1-(吡啶-2-基)-1 H-吲哚与内部炔烃的C2选择性C–H链烯基化/环化级联转化,可得到吡啶基[2',1':2,3]介绍了嘧啶基[1,6- a ]吲哚-5-鎓。此外,可以通过还原反应,有效地构建6,7-二氢-4 H-吡啶基[2',1':2,3]嘧啶基[1,6- a ]吲哚,一种新型的功能化的N稠合吲哚核杂环。NaBH 4引发吡啶并[2',1':2,3]嘧啶并[1,6 - a ]吲哚-5-鎓。
Ruthenium(II)-carboxylate-catalyzed C4/C6–H dual alkylations of indoles
作者:Isaac Choi、Valentin Müller、Lutz Ackermann
DOI:10.1016/j.tetlet.2021.153064
日期:2021.5
C4/C6–H double alkylations of indoles accomplished by arene-ligand-free ruthenium(II)-carboxylate catalysis. Base-assisted C2–H ruthenation enabled the C4/C6–H dialkylations with ample substrate scope. The robust C4/C6–H alkylations were demonstrated by gram-scale syntheses and late-stage diversifications. Mechanistic studies unraveled the unique features of ruthenium(II)-catalyzed C4/C6–H indole functionalizations