β-Elimination of the isonitrile group in alkylation reactions of C–H acids activated by the isonitrile function
作者:Mikołaj Jawdosiuk、Maciej Umiński
DOI:10.1039/c39820000979
日期:——
During phase-transfer alkylation of the isonitriles R1R2CHNC with X–CH2–Y, where X is a leaving group and Y an electron withdrawing group, some of the alkylation products undergo β-elimination of the isonitrilefunction to yield R1R2CCHY.
在异氰酸酯R 1 R 2 CHNC用X–CH 2 –Y进行相转移烷基化的过程中,其中X是一个离去基团,Y是一个吸电子基团,一些烷基化产物会经历β-消除的异腈官能团,从而生成R 1 R 2 C CHY。
Divergent Syntheses of Indoles and Quinolines Involving N1–C2–C3 Bond Formation through Two Distinct Pd Catalyses
作者:Su San Jang、Young Ho Kim、So Won Youn
DOI:10.1021/acs.orglett.0c02898
日期:2020.12.4
annulative couplings of 2-alkenylanilines with aldehydes using alcohols as both the solvent and hydrogen source have been developed. These domino processes allow divergent syntheses of two significant N-heterocycles, indoles and quinolines, from the same substrate by tuning reaction parameters, which seems to invoke two distinct mechanisms. The nature of the ligand and alcoholic solvent had a profound
Decarboxylative Cross-Coupling of Mesylates Catalyzed by Copper/Palladium Systems with Customized Imidazolyl Phosphine Ligands
作者:Bingrui Song、Thomas Knauber、Lukas J. Gooßen
DOI:10.1002/anie.201208025
日期:2013.3.4
The activation of the inert CO bonds in mesylates through the use of a new class of imidazolyl phosphines allows the decarboxylative coupling of aryl mesylates as well as polysubstituted alkenyl mesylates. Variation of the ligands leads to two complementary methods providing the corresponding biaryls and polysubstituted olefins in good yields.
Counterion Control of
<i>t</i>
‐BuO‐Mediated Single Electron Transfer to Nitrostilbenes to Construct
<i>N</i>
‐Hydroxyindoles or Oxindoles
作者:Yingwei Zhao、Haoran Zhu、Siyoung Sung、Donald J. Wink、Joseph M. Zadrozny、Tom G. Driver
DOI:10.1002/anie.202104319
日期:2021.8.23
tert-Butoxide unlocks new reactivity patterns embedded in nitroarenes. Exposure of nitrostilbenes to sodium tert-butoxide was found to produce N-hydroxyindoles at room temperature without an additive. Changing the counterion to potassium changed the reaction outcome to yield solely oxindoles through an unprecedented dioxygen-transfer reaction followed by a 1,2-phenyl migration. Mechanistic experiments
Palladium-Catalyzed Formation of<i>N</i>-Heteroarenes from Nitroarenes using Molybdenum Hexacarbonyl as the Source of Carbon Monoxide
作者:Fei Zhou、Duo-Sheng Wang、Tom G. Driver
DOI:10.1002/adsc.201500700
日期:2015.11.16
The development of a method that employs a two-chamber reaction vessel and uses molybdenum hexacarbonyl [Mo(CO)6] as the carbon monoxide (CO) source for the palladium-catalyzed transformation of nitroarenes into indoles or imidazoles is reported. The scope and limitations of our method are illustrated with 23 examples. Experiments that indicate the mechanism of the CH bond amination reaction to be