An efficient method to prepare amides by a cascade strategy was developed. Using nBu4NI or NaI as the catalyst and tert-butyl hydroperoxide as the oxidant, various alcohols reacted with N-hydroxysuccinimide or N-hydroxyphthalimide affording corresponding active esters in moderate to good yield. The resulting active esters were converted into amides smoothly in one pot.
开发了一种通过级联策略制备酰胺的有效方法。使用n Bu 4 NI或NaI作为催化剂,氢过氧化叔丁基作为氧化剂,各种醇与N-羟基琥珀酰亚胺或N-羟基邻苯二甲酰亚胺反应,以中等至良好的产率提供相应的活性酯。在一锅中将所得的活性酯平稳地转化为酰胺。
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
<i>tert-</i>Butyl Nitrite as a Twofold Hydrogen Abstractor for Dehydrogenative Coupling of Aldehydes with <i>N</i>-Hydroxyimides
作者:Peng-Fei Dai、Yi-Ping Wang、Jian-Ping Qu、Yan-Biao Kang
DOI:10.1021/acs.orglett.1c03434
日期:2021.12.17
practical transition metal/catalyst/halogen-free dehydrogenative coupling of aldehydes with N-hydroxyimides promoted solely by tert-butyl nitrite under mild conditions was developed. tert-Butyl nitrite generates two radicals (tBuO and NO) and thus works as a twofold hydrogen abstractor. A diverse array of N-hydroxyimide esters were prepared from either aliphatic or aromatic aldehydes. Benzoyl-substituted
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