direct synthesis of quinoxaline derivatives via tandem N-heterocycliccarbene (NHC)-catalyzed umpolung of aldehydes/oxidation of the benzoins to benzils/condensation of benzils with benzene-1,2-diamines has been developed. A one-pot efficient and facile protocol for the direct synthesis of quinoxaline derivatives via tandem N-heterocycliccarbene (NHC)-catalyzed umpolung of aldehydes/oxidation of the
An efficient synthesis of indolo[3,2-a]carbazoles via the novel acid catalyzed reaction of indoles and diaryl-1,2-diones
作者:Vijay Nair、Vidya Nandialath、Keecherikunnel G. Abhilash、Eringathodi Suresh
DOI:10.1039/b803009j
日期:——
A mild and efficient one pot method for the synthesis of indolo[3,2-a]carbazole derivatives by the para-toluenesulfonic acid catalyzed condensation of indole with acyclic 1,2-diones is described. With cyclobutene-1,2-diones the reaction afforded indole substituted carbazole derivatives in good yield.
The Reaction of Huisgen Zwitterion with Diaryl-1,2-diones and Ketones: An Efficient Protocol for Carbon-Nitrogen Bond Formation
作者:Vijay Nair、A. Biju、Smitha Mathew
DOI:10.1055/s-2007-965910
日期:2007.3
The reaction of Huisgen zwitterion, derived from triphenylphosphine and dialkyl azodicarboxylate, with diaryl-1,2-diones afforded N,N-dicarboalkoxy monohydrazones via a mechanistically novel rearrangement. Cyclic and acyclic ketones furnished vinyl hydrazinedicarboxylates under similar conditions.
Reaction of Diaryl-1,2-diones with Triphenylphosphine and Diethyl Azodicarboxylate Leading to <i>N</i>,<i>N</i>-Dicarboethoxy Monohydrazones via a Novel Rearrangement
作者:Vijay Nair、A. T. Biju、K. G. Abhilash、Rajeev S. Menon、Eringathodi Suresh
DOI:10.1021/ol050403+
日期:2005.5.1
[reaction: see text]. A mechanistically novel reaction of diaryl-1,2-diones with diethylazodicarboxylate and triphenylphosphine to afford N,N-dicarboethoxy monohydrazones is described. The reaction proceeds via a nitrogen to nitrogen migration of a carboethoxy group.
Pyridine-Catalyzed Addition of Diaryl-1,2-diones to Dimethyl Butynedioate Leading to the Formation of 1,2-Diaroyl Dimethyl Maleates via an Unprecedented Rearrangement
作者:Vijay Nair、Abhilash N. Pillai、Rajeev S. Menon、Eringathodi Suresh
DOI:10.1021/ol050225k
日期:2005.3.1
[reaction: see text] Pyridine catalyzes the reaction of 1,2-diaryl diones with dimethyl butynedioate to afford diaroyl maleates. This unprecedentedrearrangement involves a unique benzoyl migration and proceeds with complete stereoselectivity.