Catalytic C-2 Allylation of Indoles by Electronic Modulation of the Indole Ring and its Application to the Synthesis of Functionalized Carbazoles
作者:Ju Young Lee、Hyeri Ha、Seri Bae、Inhyuk Han、Jung Min Joo
DOI:10.1002/adsc.201600568
日期:2016.11.3
We report a palladium‐catalyzed C‐2 allylation of indoles and subsequent cyclization of the allylated indoles. The electronic effects of chloro and ester groups that can be readily installed at the C‐3 position of indoles facilitated a highly efficient C–H allylation at the C‐2 position. The resulting 2‐allyl‐3‐chloroindoles were found to be suitable substrates for benzannulation reactions with alkynes
Enantioselective Allylic Alkylation with 4-Alkyl-1,4-dihydro-pyridines Enabled by Photoredox/Palladium Cocatalysis
作者:Hong-Hao Zhang、Jia-Jia Zhao、Shouyun Yu
DOI:10.1021/jacs.8b10766
日期:2018.12.12
alkylation has been achieved enabled by the merger of photoredox and palladiumcatalysis. In this dual catalytic process, alkyl radicals generated from 4-alkyl-1,4-dihydropyridines act as the coupling partners of the π-allyl palladium complexes. The generality of this method has been illustrated through the reaction of a variety of allylesters with 4-alkyl-1,4-dihydropyridines. This mechanistically novel
Iridium-catalyzed allylic alkylation of monosubstituted allylic acetates with azlactone, and separation of diastereoisomers by sequential aza-Cope rearrangement
The iridium-catalyzedallylicalkylation with azlactone and sequential aza-Cope rearrangement was demonstrated. The sequential reaction was effective in separating of diastereoisomers and afforded a diastereomerically pure azlactone derivative and oxazolinone derivative.
Enantioselective α-Allylation of Anilines Enabled by a Combined Palladium and Photoredox Catalytic System
作者:Hong-Hao Zhang、Jia-Jia Zhao、Shouyun Yu
DOI:10.1021/acscatal.0c00871
日期:2020.4.17
branch-regioselective α-allylation of N-methyl anilines under dual palladium/photoredoxcatalysis is described. Readily available N-methyl anilines are used as formal “hard” alkyl nucleophiles without preactivation. Acetic acid is the only side product, which leads to a high atom economy of this reaction. This protocol shows good functional group tolerance and broad scope. A range of chiral homoallylic amines were
Rh-Catalyzed Asymmetric Allylic Substitution with Photo-Generated Alkyl Radical Species
作者:Rui-Xiang Wang、Pusu Yang、Yuan-Zheng Cheng、Shu-Li You
DOI:10.1021/acscatal.4c03683
日期:2024.8.16
Herein, we report a dual photoredox/Rh-catalyzed asymmetric allylic substitution reaction with in situ-generated alkyl radical species. Under mild reaction conditions, a broad range of products are obtained in 48–80% yields with 80–98% ee. Notably, the photocatalyst plays a key role in this method, not only assisting the generation of alkyl radicals from 4-alkyl-1,4-dihydropryidines but also facilitating