Blue LED-Mediated N–H Insertion of Indoles into Aryldiazoesters at Room Temperature in Batch and Flow: Reaction Kinetics, Density Functional Theory, and Mechanistic Study
作者:Debajit Maiti、Ranajit Das、Subhabrata Sen
DOI:10.1021/acs.joc.0c02649
日期:2021.2.5
blue light-mediated N–H insertion of indole and its derivatives into aryldiazoesters has been reported in a batch and flow strategy to afford the corresponding N-alkylated product in moderate-to-excellent yield. Detailed high-performance liquid chromatography-based reaction kinetics measurements, control experiments, and kinetic isotope effect reveal that 3-substitutedindoles with electron-withdrawing
Electron Transfer Photoredox Catalysis: Development of a Photoactivated Reductive Desulfonylation of an Aza‐Heteroaromatic Ring
作者:Qiang‐Liu、Yu‐Xiu Liu、Hong‐Jian Song、Qing‐Min Wang
DOI:10.1002/adsc.202000578
日期:2020.8.4
protocol for desulfonylation of aza‐heteroaromatic rings via photoinduced electrontransfer and hydrogen atom transfer. This general protocol has a wide substrate range and moderate to good yields. The utility of the method was demonstrated by the chemoselective desulfonylation of a molecule containing both an aliphatic and an aromatic sulfonamide.
Dual Activation of Nucleophiles and Electrophiles by N-Heterocyclic Carbene Organocatalysis: Chemoselective N-Imination of Indoles with Isocyanides
作者:Jungwon Kim、Soon Hyeok Hong
DOI:10.1021/acs.orglett.7b01377
日期:2017.6.16
first chemoselective N-imination of indoles with isocyanides by using an N-heterocyclic carbene (NHC) as an organocatalyst was achieved. A concurrent activation of nucleophile (indole) and electrophile (isocyanide) took place facilitated by the novel NHC organocatalysis via initial activation of isocyanide. The in situ generated indole anion and imine-azolium species performed a coupling reaction, producing
Rhodium‐Catalyzed Chemodivergent Regio‐ and Enantioselective Allylic Alkylation of Indoles
作者:Minghe Sun、Min Liu、Changkun Li
DOI:10.1002/chem.202004613
日期:2021.2.15
C3/N1 chemoselectivity in indole alkylation with the same electrophiles is still challenging. An Rh/bisoxazolinephosphane‐catalyzed chemodivergent regio‐ and enantioselectiveallylicalkylation of indoles was developed. Chiral C3‐ and N1‐allylindoles can be selectively obtained with high branched/linear ratio and up to 99 % ee by changing the counteranion of Rh, the allylic carbonate, the reaction temperature
Palladium-catalyzed hydroamination of vinylidenecyclopropane-diester with pyrroles and indoles: an approach to azaaromatic vinylcyclopropanes
作者:Ze-ren Yang、Bo Zhang、Yong-jie Long、Min Shi
DOI:10.1039/d2cc03635e
日期:——
A new method for the synthesis of azaaromatic vinylcyclopropanes (VCPs) has been disclosed in this paper by using pyrrole or indole derivatives as nucleophilic reagents to react with vinylidenecyclopropane-diesters (VDCP-diesters) in the presence of a Pd catalyst, a phosphine ligand and a base under mild conditions in up to 98% yield with a reasonable substrate scope. This reaction is one of the few