A Highly Regioselective C-3 Benzylation Reaction of Indoles with Alcohols Catalysed by an N-Heterocyclic Carbene
作者:Yan-fang Zhu、Guo-ping Lu、Chun Cai
DOI:10.3184/174751915x14376593652711
日期:2015.8
The direct C-3alkylation of indoles with primary and secondary alcohols through the combination of KOH and an N-heterocyclic carbene is described. The KOH/NHC-catalysed system can give desired C-3 alkylated indoles with high selectivity in moderate to excellent yields. Moreover, this process has obvious advantages such as high atom economy and the absence of a metal source.
Dual Catalysis in Domino<i>N</i>-Benzylation/Intramolecular C-H Arylation: Regio- and Chemoselective Synthesis of Annelated Nitrogen Heterocycles
作者:Joydev K. Laha、Neetu Dayal、Swati Singh、Rohan Bhimpuria
DOI:10.1002/ejoc.201402395
日期:2014.9
A general method has been developed for the synthesis of fused nitrogenheterocycles by using a domino N-benzylation/C–Harylation reaction sequence. The details and yields of the domino process were compared with those of the two-step literature protocol. Fused azaindoles, which are otherwise difficult to obtain, were synthesized by using this process. The unprecedented catalytic role of PPh3 in this
Benzylic Substitution of Gramines with Boronic Acids and Rhodium or Iridium Catalysts<sup>†</sup>
作者:Gabriela de la Herrán、Amaya Segura、Aurelio G. Csákÿ
DOI:10.1021/ol063042m
日期:2007.3.1
Gramine-Mel salts were useful starting materials for the synthesis of 3-benzyl- and 3-allylindoles by the 1,4-addition of boronic acids to the C=C-C=N linkages generated in situ under Rh(I)-catalysis. On the other hand, under Ir(I) catalysis, the reaction of gramines with indoles was used to produce nonsymmetrical diindolylmethanes.
Palladium-Catalyzed Dearomatization of Indoles with Alkynes: Construction of Spirocyclohexaneindolenines