Allenyl Azide Cycloaddition Chemistry. Synthesis of Annelated Indoles from 2-(Allenyl)phenyl Azide Substrates
摘要:
[GRAPHICS]Thermolysis of 2-(allenyl) phenyl azides leads to a cascade cyclization sequence furnishing both C(2)-C(3) and N-C(2) cyclopentannelated indoles.
Synthesis and biological evaluation of structural variants of carbazoquinocin C
作者:Alparslan Aygün、Ulf Pindur
DOI:10.1002/jhet.5570400303
日期:2003.5
Some new structuralvariants of the alkaloid carbazoquinocinC were synthesized in a few steps with good to excellent yields. The key step comprises a cyclisation reaction of appropriate 2-vinylindoles with oxalyl chloride. The carbazole-3,4-quinones are able to trap oxygen-centred radicals. In some biological/biochemical assays some of these compounds exhibit extraordinary results including inhibition
Allenyl Azide Cycloaddition Chemistry. 2,3-Cyclopentennelated Indole Synthesis through Indolidene Intermediates
作者:Ken S. Feldman、D. Keith Hester、Malliga R. Iyer、Paul J. Munson、Carlos Silva López、Olalla Nieto Faza
DOI:10.1021/jo900659w
日期:2009.7.17
The thermal, photochemical, and photochemical/CuI-mediated cascade cyclizations of a range of substituted 1-(2-azidophenyl)-3-alkenylallenes are described. These reactions provide both 1,2- and 2,3-cyclopentennelated indole products in varying ratios. In most cases, high regioselectivity for the 2,3-annelated isomer can be achieved under the hv/CuI conditions. Computational studies of this multistep reaction support the intermediacy of indolidene intermediates whose electrocyclizations (with or without copper present) define the regioselectivity branch point in the sequence.
Allenyl Azide Cycloaddition Chemistry. Synthesis of Annelated Indoles from 2-(Allenyl)phenyl Azide Substrates
作者:Ken S. Feldman、Malliga R. Iyer、D. Keith Hester
DOI:10.1021/ol061216u
日期:2006.7.1
[GRAPHICS]Thermolysis of 2-(allenyl) phenyl azides leads to a cascade cyclization sequence furnishing both C(2)-C(3) and N-C(2) cyclopentannelated indoles.
Carbazoquinocin Analogues as Small Molecule Biomimetic Organocatalysts in Dehydrogenative Coupling of Amines
作者:Samrat Kundu、Chayan Ghosh、Abhisek Metya、Ankush Banerjee、Modhu Sudan Maji
DOI:10.1021/acs.orglett.4c00229
日期:2024.3.1
biomimetic ortho-quinone catalysts structurally resembling carbazoquinocin alkaloids have been introduced to promote tunable, metal cocatalyst-free, organocatalytic, dehydrogenative amineoxidationunderaerobicconditions. Differently substituted benzyl amines were tolerated under optimized conditions to provide imines in excellent yields. Further efficacy of the catalyst was demonstrated by synthesizing