Dual Gold‐Catalyzed Formal Tetradehydro‐Diels–Alder Reactions for the Synthesis of Carbazoles and Indolines
作者:Hong‐Fa Wang、Shi‐Yue Wang、Tian‐Zhu Qin、Weiwei Zi
DOI:10.1002/chem.201804529
日期:2018.12.5
dual gold‐catalyzed tetradehydro‐Diels–Alderreaction for the synthesis of nitrogen‐containing aromatic heterocycles. Under the catalytic system (IPrAuNTf2/DIPEA), indolines and carbazoles as well as other N‐containing aromatic heterocycles were prepared in high yields with good functional group tolerance. Unlike the traditional thermal tetradehydro‐Diels–Alderreactions, diluted reaction concentration
A new approach to carbazoles and benzannulated carbazoles by means of intramolecular dehydro Diels–Alder of ynamides is reported. N-(o-Ethynyl)aryl ynamides and N-(o-ethynyl) arylynamides were prepared in a few steps starting from o-iodoaniline. Thermal cycloaddition of N-(o-ethynyl)aryl ynamides and N-(o-ethynyl) arylynamides affords carbazoles and benzannulated and heteroannulated carbazoles in moderate-to-good
Scandium-Catalyzed Intramolecular Friedel–Crafts Reactions of 2-[(2-Alkyl-1H-indol-3-yl)methylene]malonates
作者:Chang Oh、Hyo Park、Nari Park、So Kim、Lanhua Piao
DOI:10.1055/s-0033-1340350
日期:——
We have synthesized a variety of 2-[(2-alkyl-1H-indol-3-yl)methylene]malonates and studied their scandium-catalyzed intramolecular Friedel-Crafts reactions leading to the corresponding polycyclic compounds such as indeno[1,2-b]indoles and benzo[1,2-b]carbazoles.