Thermal 1,6-Electrocyclization Reactions of Acceptor-Substituted 2,3-Divinyl-1H-indoles Yielding Functionalized Carbazoles
作者:Ulf Pindur、Reinhard Adam
DOI:10.1002/hlca.19900730408
日期:1990.6.20
Three new synthetic procedures for and thermal 1,6-electrocyclizations of acceptor-substituted2,3-divinyl-1H-indoles leading to functionalizingcarbazoles are described. The scope and limitations as well as some mechanistic aspects of the methodologies are discussed. The key strategies employed include Pd(II)-catalyzed coupling and Wittig procedures.
A Tandem Approach to Functionalized Carbazoles from Indoles via Two Successive Regioselective Oxidative Heck Reactions Followed by Thermal Electrocyclization
作者:Joydev K. Laha、Neetu Dayal
DOI:10.1021/acs.orglett.5b02265
日期:2015.10.2
A direct one-pot approach to the synthesis of carbazoles (mono-, di-, and trisubstituted) and α-carbolines from readily available indoles or 7-azaindoles and alkenes is described. Based on mechanistic studies, the tandem reaction follows the sequence: palladium-catalyzed regioselective C-3 alkenylation/palladium-catalyzed C-2 alkenylation/thermal electrocyclization.
Anionic [4+2] cycloaddition reactions of indole-2,3-dienolate with dienophiles: A facile regiospecific route to substituted carbazoles
作者:Mandava V. Basaveswara Rao、Janagani Satyanarayana、Hiriyakkanavar Ila、Hiriyakkanavar Junjappa
DOI:10.1016/0040-4039(95)00488-x
日期:1995.5
3-dienolate derived by deprotonation of 1,2-dimethylindole-3-carboxaldehyde is shown to be useful 1,4-dipole synthon (anionic indolo-2,3-quinodimethane) which undergoes facile cycloaddition with wide range of dienophiles affording substituted carbazoles in highly regiospecific fashion.