We have developed a novel and efficient iridium-catalyzed hydrogen isotopeexchangereaction method with secondary and tertiary sulfonamides at ambient temperatures. Furthermore N-oxides and phosphonamides have been successfully applied in hydrogen isotopeexchangereactions with moderate to excellent deuterium introduction.
Visible‐Light‐Mediated Heterocycle Functionalization via Geometrically Interrupted [2+2] Cycloaddition
作者:Mihai V. Popescu、Aroonroj Mekereeya、Juan V. Alegre‐Requena、Robert S. Paton、Martin D. Smith
DOI:10.1002/anie.202009704
日期:2020.12.14
cyclization in the triplet excited state to yield a 1,4‐diradical; intersystem crossing leads preferentially to the closed shell singlet zwitterion. This is geometrically restricted from undergoing recombination to yield a cyclobutane by the planarity of the amide substituent. A prototropic shift leads to the observed bicyclic products in what can be viewed as an interrupted [2+2] cycloaddition.
Copper-Catalyzed Synthesis of 2-Aminocarbazoles through Cascade C-C and C-N Bond Formation and Aromatization
作者:Xinlei Liu、Jiangkun Huang、Huibei Xu、Dandan Zhang、Qiu Sun、Ling He
DOI:10.1002/ejoc.201801297
日期:2019.2.7
The one‐pot synthesis of 2‐aminocarbanoles from 1‐(1H‐indole‐3‐yl)pentan‐3‐one through cascade C–C/C–N bond formation using ammonium carbonate as a nitrogen source and copper salt as a catalysis is reported.
A new approach to C-2 arylated indoles has been developed by utilizing a ruthenium-catalyzed, heteroatom-directed regioselective C-H arylation. The reaction is highly site-selective and results in very good yields. The highlight of the work is the use of a removable directing group and compatibility of the catalytic system with halogen functional groups in the substrates.