Palladium-Catalyzed Coupling of<i>ortho</i>-Alkynylanilines with Terminal Alkynes Under Aerobic Conditions: Efficient Synthesis of 2,3-Disubstituted 3-Alkynylindoles
作者:Bo Yao、Qian Wang、Jieping Zhu
DOI:10.1002/anie.201205596
日期:2012.12.3
Two nucleophiles, one triple bond: Under aerobic conditions, palladium‐catalyzed direct coupling of o‐alkynylanilines and terminalalkynes took place smoothly to afford the 2,3‐disubstituted 3‐alkynylindoles 3 in good to excellent yields. The intermediate A was characterized and a retro‐aminopalladation of B was observed for the first time.
synthesis of N-methyl-3-chalcogeno-indoles has been developed via iodine-mediatedelectrophilicannulation reactions of 2-alkynylaniline derivatives with disulfides or diselenides. In the presence of iodine and iron, a variety of 2-alkynylanilines selectively underwent the electrophilicannulation with numerous disulfides or diselenides leading to the corresponding 3-sulfenylindoles and 3-selenenylindoles
Palladium(II)-Catalyzed Cyclizative Cross-Coupling of<i>ortho</i>-Alkynylanilines with<i>ortho</i>-Alkynylbenzamides under Aerobic Conditions
作者:Bo Yao、Qian Wang、Jieping Zhu
DOI:10.1002/anie.201307738
日期:2013.12.2
Born to couple: The Pd(OAc)2‐catalyzed reaction of o‐alkynylanilines (1) with o‐alkynylbenzamides (2) affords the cyclizative cross‐coupling products 3 in good to excellent yields. Three bonds are created in the formation of two heterocycles tethered by a tetrasubstituted double bond. Mechanistic studies indicate that the reaction is initiated by aminopalladation with subsequent oxypalladation, N‐demethylation
A facile route to 5-methyl-5H-indeno[1,2-c]quinolones via palladium-catalyzed cyclization of 2-alkynylbromobenzenes with N,N-dimethyl-2-alkynylanilines
作者:Xiaolin Pan、Yong Luo、Yunyan Kuang、Guangming Li
DOI:10.1039/c4ob00706a
日期:——
A tandem reaction catalyzed by palladium is developed to provide a facile and simple route for the synthesis of 5-methyl-5H-indeno[1,2-c]quinolones.
由钯催化的串联反应被开发出来,为合成5-甲基-5H-吲哚[1,2-c]喹啉提供了一种简便的方法。
Cyclizations via Frustrated Lewis Pairs: Lewis Acid Induced Intramolecular Additions of Amines to Olefins and Alkynes
作者:Tanja Voss、Chao Chen、Gerald Kehr、Elisa Nauha、Gerhard Erker、Douglas W. Stephan
DOI:10.1002/chem.200903483
日期:2010.3.8
Intramolecularadditions of amines to olefinic and acetylenic residues in the presence of B(C6F5)3 affords a “frustratedLewisPair” strategy to five‐ and six‐membered‐ring heterocyclic ammonium borate derivatives (see picture).
在B(C 6 F 5)3存在下,将胺分子内加成到烯属和炔属残基上,为五元和六元环杂环硼酸铵衍生物提供了“沮丧的路易斯对”策略(见图)。