New synthetic approaches for the synthesis of indoloquinolines and carbocycle-fused quinolines have been developed employing alkynylketone substrates. These synthetic transformations involved the application of N2-extrusion of azido complexes as a key step to generate carbodiimidium ion and nitriliumion in situ, which further cyclized intramolecularly with alkyne via a domino process to provide indoloquinolines
Regioselective electrochemical radical cascade cyclization of internal alkynes to selenated and trifluoromethylated dihydropyran
作者:Mingming Yu、Tiantian Huang、Lin Zhang、Muhammad Shabbir、Yuhan Gao、Yi-Hung Chen、Hong Yi、Aiwen Lei
DOI:10.1007/s11426-023-1703-8
日期:2023.11
trifluoromethylated DHP compounds. The reaction proceeded smoothly under mild electrolysis conditions. The broad substrate scope (>50 examples) and scalablesynthesis demonstrated the complexity-building potential of the strategy. Initial mechanistic studies reveal that cyclization may involve a radical process. This protocol may promote the further development of diversified synthesis of multi-substituted dihydropyran
Synthesis of Azomethine Imines Using an Intramolecular Alkyne Hydrohydrazination Approach
作者:Ashley D. Hunt、Isabelle Dion、Nicolas Das Neves、Sandrine Taing、André M. Beauchemin
DOI:10.1021/jo4011409
日期:2013.9.6
Azomethine imines can be accessed upon heating appropriate alkynylhydrazide precursors. This simple thermal hydroamination approach allows the formation of five- and six-membered dipoles in modest to excellent yields. The structure of the acyl group is important to minimize side reactions and allow the isolation of the azomethine imines by column chromatography.