A Modified System for the Synthesis of Enantioenriched
<i>N</i>
‐Arylamines through Copper‐Catalyzed Hydroamination
作者:Saki Ichikawa、Shaolin Zhu、Stephen L. Buchwald
DOI:10.1002/anie.201803026
日期:2018.7.9
Despite significant recent progress in copper‐catalyzed enantioselective hydroamination chemistry, the synthesis of chiral N‐arylamines, which are frequently found in natural products and pharmaceuticals, has not been realized. Initial experiments with N‐arylhydroxylamine ester electrophiles were unsuccessful and, instead, their reduction in the presence of copper hydride (CuH) catalysts was observed
New Method for Oxidative Carbon-carbon Bond Formation by the Reaction of Allyl Ethers, 2,3-Dichloro-5,6-dicyano-<i>p</i>-benzoquinone(DDQ) and Silyl Carbon Nucleophiles
作者:Yujiro Hayashi、Teruaki Mukaiyama
DOI:10.1246/cl.1987.1811
日期:1987.9.5
Allylethers are oxidized by DDQ to generate the corresponding cationic species, which in turn react with silyl carbon nucleophiles in the presence of a catalytic amount of lithium perchlorate to afford the coupled products in a one-pot procedure in good yields.
A facile TfOH-catalyzed oxidative cyclization of allyl compounds and isocyanide has been developed with the assistance of DDQ, where isocyanide is used as the crucial "N" and "CN" sources. Highly functionalized 2-cyanopyrroles are constructed efficiently through a new formal [3 + 2] mode, demonstrating diverse reactivity and synthetic utility in organic chemistry. 2-Cyanopyrrole is converted into a