Palladium-catalyzed regioselective C-2 arylation of 7-azaindoles, indoles, and pyrroles with arenes
作者:Joydev K. Laha、Rohan A. Bhimpuria、Dilip V. Prajapati、Neetu Dayal、Shubhra Sharma
DOI:10.1039/c6cc00133e
日期:——
A palladium-catalyzed regioselective C-2 arylation of 7-azaindoles, indoles, and pyrroles with arenes has been developed. The study unveils that a critical substrate dependent acid concentration is essential for achieving exclusive...
Catalyst-Controlled Chemodivergent Reactions of 2-Pyrrolyl-α-diazo-β-ketoesters and Enol Ethers: Synthesis of 1,2-Dihydrofuran Acetals and Highly Substituted Indoles
作者:Gabriel Guerra Faura、Tena Nguyen、Stefan France
DOI:10.1021/acs.joc.1c00826
日期:2021.8.6
chemodivergent reaction of pyrrolyl-α-diazo-β-ketoesters with enolethers is reported. While Cu(II) catalysts selectively promoted a [3 + 2] cycloaddition to provide pyrrolyl-substituted 2,3-dihydrofuran (DHF) acetals, dimeric Rh(II) catalysts afforded 6-hydroxyindole-7-carboxylates via an unreported [4 + 2] benzannulation. The choice of enolether proved to be crucial in determining both regioselectivity
Room-Temperature Gold-Catalysed Arylation of Heteroarenes: Complementarity to Palladium Catalysis
作者:Alexander J. Cresswell、Guy C. Lloyd-Jones
DOI:10.1002/chem.201602893
日期:2016.8.26
Tailoring of the pre‐catalyst, the oxidant and the arylsilane enables the first room‐temperature, gold‐catalysed, innate C−H arylation of heteroarenes. Regioselectivity is consistently high and, in some cases, distinct from that reported with palladium catalysis. Tolerance to halides and boronic esters, in both the heteroarene and silane partners, provides orthogonality to Suzuki–Miyaura coupling.
Design and Implementation of a Catalytic Electron Donor–Acceptor Complex Platform for Radical Trifluoromethylation and Alkylation
作者:Edward J. McClain、Timothy M. Monos、Mayuko Mori、Joel W. Beatty、Corey R. J. Stephenson
DOI:10.1021/acscatal.0c03837
日期:2020.11.6
rare example of EDA photochemistry in a catalytic regime. The synthetic utility is demonstrated through visible light-driven radicaltrifluoromethylation and Minisci alkylation reactions. The scalability of the EDA complex-promoted reaction is evidenced by the successful multigram-scale trifluoromethylation of methyl N-Boc pyrrole-2-carboxylate in a continuous flow manifold.
Integration of oxidative arylation with sulfonyl migration: one-pot tandem synthesis of densely functionalized (NH)-pyrroles
作者:Joydev K. Laha、Shubhra Sharma、Rohan A. Bhimpuria、Neetu Dayal、Gurudutt Dubey、Prasad V. Bharatam
DOI:10.1039/c7nj01709j
日期:——
oxidative C-2 arylation followed by sulfonylmigration is described. The simple, easyaccess to the highlyfunctionalized free-NH pyrroles secures opportunities for the preparation of compounds with promising biological activities in contemporary organic synthesis. The event of sulfonylmigration from pyrrole-N to C-3 is thermodynamically favored as revealed by density functional methods. The different plausible