well‐developed and growing body of work in Cu catalysis, the potential of Cu to serve as a photocatalyst remains underexplored. Reported herein is the first example of visible‐light‐induced Cu‐catalyzed decarboxylative C(sp3)−H alkylation of glycine for preparing α‐alkylated unnatural α‐amino acids. It merits mentioning that the mild conditions and the good functional‐group tolerance allow the modification
Copper nitrate-catalyzed oxidative coupling of unactivated C(sp<sup>3</sup>)–H bonds of ethers and alkanes with <i>N</i>-hydroxyphthalimide: synthesis of <i>N</i>-hydroxyimide esters
between N-hydroxyphthalimide (NHPI) and ethers/alkanes has been described. The reaction is accomplished smoothly by using simple and green molecular oxygen as the oxidant, providing an alternative for the efficient synthesis of N-alkoxyphthalimides. In addition, it was found that when tert-butyl ethers were used as substrates, unexpected N-hydroxyimide ester derivatives were obtained in moderate to
Visible-Light-Induced Copper-Catalyzed Decarboxylative Coupling of Redox-Active Esters with <i>N</i>-Heteroarenes
作者:Xue-Li Lyu、Shi-Sheng Huang、Hong-Jian Song、Yu-Xiu Liu、Qing-Min Wang
DOI:10.1021/acs.orglett.9b02105
日期:2019.7.19
Herein we report a protocol for visible-light-induced copper-catalyzed decarboxylative coupling reactions between N-heteroarenes and redox-active esters. Various N-hydroxyphthalimide esters reacted with isoquinoline, quinoline, pyridine, pyrimidine, quinazoline, phthalazine, phenanthridine, and pyridazine to give the corresponding products in modest to excellent yields. The reactions proceed under
Electrochemical decarboxylative C3 alkylation of quinoxalin-2(1<i>H</i>)-ones with <i>N</i>-hydroxyphthalimide esters
作者:Kaikai Niu、Lingyun Song、Yanke Hao、Yuxiu Liu、Qingmin Wang
DOI:10.1039/d0cc05391k
日期:——
We have developed a protocol for electrochemical decarboxylative C3 alkylation of a wide range of quinoxalin-2(1H)-ones under metal- and additive-free conditions. N-Hydroxyphthalimide esters derived from chain, cyclic, primary, secondary, and tertiary carboxylic acids with a broad scope proved to be suitable substrates. This operationally simple protocol performed in an undivided cell under constant-current
Iron-Nitrate-Catalyzed Oxidative Esterification of Aldehydes and Alcohols with <i>N</i>
-Hydroxyphthalimide: Efficient Synthesis of <i>N</i>
-Hydroxyimide Esters
An Fe(NO3)3*9H2O-catalyzed cross-dehydrogenative coupling reaction between N-hydroxyphthalimide (NHPI) or N-hydroxysuccinimide (NHSI) and aldehydes or alcohols in the air has been described. This transformation provided an efficientapproach to prepare N-hydroxyimide ester derivatives with wide substrate scope in moderate to excellent yields.