Transition-Metal-Free Synthesis of <i>N</i>-Aryl Hydroxamic Acids via Insertion of Arynes
作者:Lanlan Zhang、Yu Geng、Zhong Jin
DOI:10.1021/acs.joc.6b00111
日期:2016.5.6
carbon–carbon double bonds, and free N–H bond of indole are found to be compatible with this process. In particular, the protocol is applicable in the synthesis of structurally diverse N-aryl hydroxamates and hydroxamicacids derived from N-protecting amino acids and peptides. In the presence of multiple amide N–H bonds, the N-arylation reaction can proceed selectively in the N–H bonds of terminal N-OBn amides
A metal-free iodine-mediated conversion of hydroxamates to esters
作者:Subhankar Ghosh、Jeet Banerjee、Rajat Ghosh、Shital K. Chattopadhyay
DOI:10.1080/00397911.2020.1737130
日期:2020.5.2
Abstract A metal-, oxidant-, and additive-free conversion of hydroxamates to esters have been achieved using molecular iodine as the reagent using a novel but not-so-explored heron-type rearrangement. The reaction proceeds with almost equal facility with substrates having either electron-donating or electron-withdrawing substituent. Similarly, α,ß-unsaturated, and sterically hindered ortho-substituted
<i>N</i>-[(Diphenoxyphosphoryl)oxy]-2-phenyl-1<i>H</i>-benzimidazole as a versatile reagent for synthesis<i>O</i>-alkylhydroxamic acids
作者:Nagnnath D. Kokare、Devanand B. Shinde
DOI:10.1002/jhet.5570450406
日期:2008.7
Highly efficient reagent, N-[(diphenoxyphosphoryl)oxy]-2-phenyl-1H-benzimidazole was synthesized and its applicability was demonstrated for the synthesis of O-alkyl hydroxamic acids. The efficiency of the reagent was evaluated through the synthesis of range of O-alkyl hydroxamic acids from aromatic carboxylic acids as well as N-protected amino acids. The enatiomeric purity of synthesized compounds
Abstract Treatment of O‐alkylhydroxylamine hydrochlorides with 2‐acyl‐4,5‐dichloropyridazin‐3(2H)‐ones in the presence of triethylamine or Amberlite® IRA‐67 in acetonitrile gave corresponding O‐alkylhydroxamic acid derivatives in excellent yields. This is an efficient, convenient, and eco‐friendly method.
Visible-light-promoted N–H functionalization of O-substituted hydroxamic acid with diazo esters
作者:Shuangshuang Xia、Yongchan Jian、Liwen Zhang、Cheng Zhang、Yuanyuan An、Yubin Wang
DOI:10.1039/d3ra02407e
日期:——
Herein we report an N–H functionalization of O-substituted hydroxamic acid with diazo esters under blue LED irradiation conditions. The present transformations could be performed efficiently under mild conditions without use of catalyst, additive and N2 atmosphere. Interestingly, when THF and 1,4-dioxane were employed as the reaction solvents, an active oxonium ylide involved three-component reaction
在此,我们报道了在蓝色 LED 照射条件下 O-取代异羟肟酸与重氮酯的 N-H 官能化。在不使用催化剂、添加剂和 N 2气氛的情况下,本转化可以在温和条件下有效地进行。有趣的是,当使用 THF 和 1,4-二恶烷作为反应溶剂时,活性氧鎓叶立德分别涉及三组分反应和卡宾物种向异羟肟酸酯中的 N-H 插入。