The complex base NaNH2-tBuONa allows expeditious synthesis of indole derivatives by arynic cyclization of imines or enamines of chloroanilines. Unstable may be used without purification, complex bases being unsensitive to impurities.
Aggregative activation and heterocyclic chemistry I complex bases promoted arynic cyclisation of imines or enaminoketones; regiochemical synthesis of indoles
The complex base NaNH2-t-BuONa allowed expeditious syntheses of indoles by arynic cyclisation of imines or enaminoketones prepared from halogeno anilines and carbonyl derivatives. Unstable imines may be used without purification, complex bases being unsensitive to impurities. It is showed that this kind of reaction may be applied to mixture of substrates suitably halogenated on the benzene ring. Formation of three components aggregates is proposed to explain a number of observations.
Kutscherowa et al., Zhurnal Obshchei Khimii, 1957, vol. 27, p. 1049,1052; engl. Ausg. S. 1131, 1134
作者:Kutscherowa et al.
DOI:——
日期:——
An Electrophilic Bromine Redox Catalysis for the Synthesis of Indole Alkaloid Building Blocks by Selective Aliphatic C−H Amination
作者:Julien Bergès、Belén García、Kilian Muñiz
DOI:10.1002/anie.201808939
日期:2018.11.26
A new homogeneous bromine(−I/I) redox catalysis is described, which is based on monomeric bromine(I) compounds containing transferable phthalimidato groups. These catalysts enable intermolecular C−H amination reactions at previously unaccessible aliphatic positions and thus enlarge the synthetic potential of direct C−N bond formation, including its application in the synthesis of alkaloid building