A hydrogen bonding-mediated double Michael addition−aromatization cascade of 2-propenylindoles and nitroolefins has been disclosed. The methodology allows an efficient synthesis of diverse and structurally complex tetrahydrocarbazoles in good to excellent enantioselectivities and diastereoselectivities.
Synthesis of Indole Substituted Twistenediones from a 2-Quinonyl Boronic Acid
作者:Jaime Rojas-Martín、Marcos Veguillas、María Ribagorda、M. Carmen Carreño
DOI:10.1021/ol402689b
日期:2013.11.15
Indole substituted twistane-like derivatives resulted in a reaction between 3,5-dimethyl-2-quinonyl boronic acid and 2-alkenyl indoles. Their MCPBA oxidation gave 6/6/9 caged systems. Boronic acid acts as a temporal promoter allowing a site-selective conjugate addition of the heteroaromatic system to the methyl substituted C-3 quinone carbon, giving an intermediate diene which is regioselectively trapped
Oxocarbons and related compounds. Part 25. Heterocycle-fused benzocyclobutenediones. Synthesis of indolo-, benzofuro- and benzothieno-dihydrobenzocyclobutenediones and benzocyclobutenediones
作者:Arthur H. Schmidt、Kai O. Lechler、Thorsten Pretz、Ingo Franz
DOI:10.1039/p19960000497
日期:——
A general and efficient procedure has been described for the synthesis of heterocycle-fused dihydrobenzocyclobutenediones and benzocyclobutenediones by reacting (alk-1-enyl)heterocycles with semisquaric chloride.
Locoselective [4 + 2] Cycloadditions of Vinylindoles with Inverse Electron Demand: A new access of indolyl-substituted and annellated pyridazines
作者:Ulf Pindur、Ludwig Pfeuffer、Myung-Hwa Kim
DOI:10.1002/hlca.19890720109
日期:1989.2.1
2-Vinylindole (1a) and its donor- and acceptor-substituted (E)-derivatives 1b–e react highly locoselectively with dimethyl 1,2,4,5-tetrazine-3,6-dicarboxylate (3) to form the novel (indol-2-yl)-1,4-dihydropyridazines 4a and 7 as well as the heterocyclic annellated pyridazines 4b, 5, and 6. The reactions of the structurally related 3-vinylindoles 2a–e with 3 also gave rise to new indol-3-ylpyridazines
The synthesis of cyclohepta[b]indole derivatives through the dearomative (4 + 3) cycloaddition reaction of 2-vinylindoles or 4H-furo[3,2-b]indoles with in situ generated oxyallylcations is reported. Oxyallylcations are generated from α-bromoketones in the presence of a base and a perfluorinated solvent. Cyclohepta[b]indole scaffolds are obtained under mild reaction conditions, in the absence of expensive