Nickel-Catalyzed Cross-Coupling of Aryl Redoxactive Esters with Aryl Zinc Reagents
作者:Bo-Hao Shih、R. Sidick Basha、Chin Fa Lee
DOI:10.1021/acscatal.9b02913
日期:2019.10.4
reaction conducted using a redox active ester with aryl zinc reagent was developed. This method demonstrates a new disconnection approach for formation of arylaryl esters. In the one-pot sequential process, the readily available aryl carboxylic acids can be converted into functionalized arylaryl esters and heteroaryl esters. This protocol is amenable to the gram-scale synthesis. The present method
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。
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
Visible Light‐Driven Efficient Synthesis of Amides from Alcohols using Cu−N−TiO
<sub>2</sub>
Heterogeneous Photocatalyst
作者:Krishnadipti Singha、Subhash Chandra Ghosh、Asit Baran Panda
DOI:10.1002/ejoc.202001466
日期:2021.1.26
practical method for direct amide synthesisfromalcohols and amines using an in situ generated active ester of N‐hydroxyimide with the earlier developed robust and recyclable Cu−N−TiO2 catalyst, at room temperature, using oxygen as a sole oxidant under visible light is discussed. The application of this amidation reaction has been successfully demonstrated for the synthesis of moclobemide, an antidepressant
<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