Photoorganocatalytic One-Pot Synthesis of Hydroxamic Acids from Aldehydes
作者:Giorgos N. Papadopoulos、Christoforos G. Kokotos
DOI:10.1002/chem.201600333
日期:2016.5.10
An efficient one‐pot synthesis of hydroxamicacids from aldehydes and hydroxylamine is described. A fast, visible‐light‐mediated metal‐free hydroacylation of dialkyl azodicarboxylates was used to develop the subsequent addition of hydroxylamine hydrochloride. A range of aliphatic and aromatic aldehydes were employed in this reaction to give hydroxamicacids in high to excellent yields. Application
One-Pot Amide Bond Formation from Aldehydes and Amines via a Photoorganocatalytic Activation of Aldehydes
作者:Giorgos N. Papadopoulos、Christoforos G. Kokotos
DOI:10.1021/acs.joc.6b00488
日期:2016.8.19
environmentally friendly synthesis of amides from aldehydes and amines is described. Initially, a photoorganocatalytic reaction of aldehydes with di-isopropyl azodicarboxylate leads to an intermediate carbonyl imide, which can react with a variety of amines to afford the desired amides. The initial visible light-mediated activation of a variety of monosubstituted or disubstituted aldehydes is usually fast,
of alkyl and acyl radicals onto electron-poor olefins or diisopropyl azodicarboxylate has been carried out on a multi-gram scale under continuous flow conditions. The process is based on the use of the inorganic photocatalyst tetrabutylammonium decatungstate (TBADT), which is capable to activate selectively a variety of CH bonds in different substrates, including aldehydes, amides, ethers and alkanes
已经在连续流动条件下以克为单位进行了一组烷基和酰基自由基在贫电子烯烃或偶氮二羧酸二异丙酯上的原子经济自由基共轭加成反应。该方法基于使用无机光催化剂四丁基癸二酸铵(TBADT),它能够选择性地活化不同底物(包括醛,酰胺,醚和烷烃)中的多种CH键。根据该程序已经合成了广泛的合成靶,包括1,4-双官能化的衍生物(例如1,4-二酮或酮酯)。所有反应均在中观条件下进行规模的流量光反应器,包括缠绕在水冷500 W中压汞蒸气灯周围的紫外线透明FEP管(氟化乙烯丙烯)的盘管。这种光化学设备的使用导致了停留时间的减少,相对于相应的批处理过程所测得的停留时间而言,STY(时空产率)和生产率值显着提高,通常会导致整体效率的提高。过程的可持续性(过程质量强度– PMI –值低至10 kg kg -1)。
Zinc Acetate as a Catalyst for the Hydroacylation Reaction of Azodicarboxylates with Aldehydes
作者:Yuancheng Qin、Dan Zhou、Mingjun Li
DOI:10.2174/157017812800233741
日期:2012.4.24
Zn(OAc)2·2H2O is found to be an effective catalyst for the hydroacylation reaction of azodicarboxylates with aldehydes. A wide range of aldehydes, including aliphatic, aromatic and heterocyclic compounds, was considered. Most of the hydroacylation reactions afforded the hydroacylation products in good to excellent yields. The overall system is simple, economical and has practical advantages for construction of carbon-nitrogen bonds.
The hydroacylationreaction of aldehydes with azodicarboxylates catalyzed by copper(II) acetate monohydrate has been reported. The reaction of various aldehydes gave the corresponding hydroacylation products in 60–98% yields under mild conditions. The method is simple, economical, and has practical advantages for the construction of the carbon–nitrogen bonds.