A novel and efficient procedure for the generation of the reactive indole-2,3-quinodimethane intermediates from the allenylanilines is described. The indole-2,3-quinodimethane intermediates were captured by several dienophiles to afford the corresponding tetrahydro- and dihydrocarbazole derivatives. This method is significantly different from the previously reported ones, which involve the 1,4-elimination or its related reactions of the indole derivatives that possess suitable substituents at both the C-2 and C-3 positions.
The two conditions for the preparation of the reactive N-(tert-butoxycarbonyl)indolo-2,3-quinodimethane intermediate were developed by the reaction of the N-(tert-butoxycarbonyl)-2-(1-ethoxycarbonyloxymethylallenyl)aniline with K2CO3 or Pd2(dba)3 in refluxing toluene. The resulting N-(tert-butoxycarbonyl)indolo-2,3-quinodimethane was captured by several alkenyl and alkynyl dienophiles to provide the
A new method for the generation of indole-2,3-quinodimethanes and 2-(N-alkoxycarbonylamino)-1,3-dienes. Intramolecular Heck/Diels–Alder cycloaddition cascade starting from acyclic α-phosphono enecarbamates
作者:Haruhiko Fuwa、Makoto Sasaki
DOI:10.1039/b704374k
日期:——
An intramolecular Heck/DielsâAlder cycloaddition cascade starting from acyclic α-phosphono enecarbamates has been developed to prepare nitrogen heterocycles viaindole-2,3-quinodimethanesand 2-(N-alkoxycarbonylamino)-1,3-dienes.
Generation and cycloaddition reactions of indole-2,3-quinodimethanes
作者:Edmund R. Marinelli
DOI:10.1016/s0040-4039(00)87447-x
日期:——
N-methyl and N-tert-butoxycarbonylindole-2,3-quinodimethanes ( and ) have been generated and observed to undergo intermolecular cycloadditionreactions with dienophiles.
Indole-2,3-quinodimethanes: Generation, reactivity and regioselective control of intermolecular Diels-Alder reactions
作者:Susan F. Vice、Helena Nandin de Carvalho、Nicholas G. Taylor、Gary I. Dmitrienko
DOI:10.1016/s0040-4039(00)70679-4
日期:1989.1
N-acylindole-2,3-quinodimethanes generated at low temperature from the N-acyl-2,3-bis (bromomethyl)indoles undergo a variety of cycloadditions including the reversible chelotropic reaction with sulphurdioxide to yield the unreported 1,3-dihydrothieno[3,4-b]indole-2,2-dioxide 9. Successful attempts to control the regioselectivity of reactions with unsymmetrical dienophiles are described.