Organocatalytic decarboxylative alkylation of <i>N</i>-hydroxy-phthalimide esters enabled by pyridine-boryl radicals
作者:Liuzhou Gao、Guoqiang Wang、Jia Cao、Dandan Yuan、Cheng Xu、Xuewen Guo、Shuhua Li
DOI:10.1039/c8cc06152a
日期:——
The decarboxylative alkylation of N-hydroxyphthalimide (NHPI) based reactive esters with olefins has been achieved via an organocatalytic strategy. Control experiments and density functional theory calculations suggest that these reactions involve a boryl-radical mediated decarboxylation pathway, which is different from the single electron transfer involved in decarboxylative alkylation reactions reported
Isonicotinate Ester Catalyzed Decarboxylative Borylation of (Hetero)Aryl and Alkenyl Carboxylic Acids through <i>N</i>-Hydroxyphthalimide Esters
作者:Wan-Min Cheng、Rui Shang、Bin Zhao、Wei-Long Xing、Yao Fu
DOI:10.1021/acs.orglett.7b01950
日期:2017.8.18
Decarboxylative borylation of aryl and alkenyl carboxylic acids with bis(pinacolato)diboron was achieved through N-hydroxyphthalimide esters using tert-butyl isonicotinate as a catalyst under base-free conditions. A variety of aryl carboxylic acids possessing different functional groups and electronic properties can be smoothly converted to aryl boronate esters, including those that are difficult to
Transition-Metal-Free, Visible-Light-Enabled Decarboxylative Borylation of Aryl <i>N</i>-Hydroxyphthalimide Esters
作者:Lisa Candish、Michael Teders、Frank Glorius
DOI:10.1021/jacs.7b03127
日期:2017.6.7
Herein, we report a conceptually novel borylation reaction proceeding via a mild photoinduced decarboxylation of redox-activated aromatic carboxylic acids. This work constitutes the first application of cheap and easily prepared N-hydroxyphthalimideesters as aryl radical precursors and does not require the use of expensive transition metals or ligands. The reaction is operationally simple, scalable
A photoinduced cross-dehydrogenative-coupling (CDC) reaction between aldehydes and <i>N</i>-hydroxyimides by a TiO<sub>2</sub>–Co ascorbic acid nanohybrid under visible light irradiation
In this study, we performed a visible light-mediated aerobic photo-cross dehydrogenative coupling (CDC) reaction between aldehydes and N-hydroxyimides using TiO2–AA–Co as a photocatalyst for the synthesis of active esters. The synergistic and selective effects of the cobalt ascorbic acid complex (Co–AA) and TiO2 nanoparticles on the visible-light photocatalytic activity were explored. The method possesses
Metal-free intermolecular C–O cross-coupling reactions: synthesis of N-hydroxyimide esters
作者:Yunhe Lv、Kai Sun、Weiya Pu、Shukuan Mao、Gang Li、Jiejie Niu、Qian Chen、Tingting Wang
DOI:10.1039/c6ra22653a
日期:——
Selectfluor-mediated intermolecular C–O crosscouplingreaction for the synthesis of N-hydroxyimide esters was developed for the first time. The reaction is applicable to the coupling of readily available aryl and alkyl aldehydes with N-hydroxyphthalimide (NHPI) and N-hydroxysuccinimide (NHSI). The resulting active esters can be directly converted into amides in onepot.