Primary amines from alkenes and carbonyl compounds: highly selective hydrogenation of oximes using a homogeneous Ru-catalyst
作者:Kevin Hares、Hannes W. Wegener、Thomas F. H. Roth、René Reichert、Dieter Vogt、Thomas Seidensticker
DOI:10.1039/d4cy00368c
日期:——
production of aliphatic primary amines is still a major challenge despite their production on a large scale. Particularly when considering the overall production route starting fromalkenes, current strategies suffer in at least one reaction step from poor regio- or chemoselectivity. This work presents an efficient and selective synthesis protocol for primary aliphatic amines via their corresponding aldoximes
尽管脂肪族伯胺已实现大规模生产,但其高效生产仍然是一个重大挑战。特别是当考虑从烯烃开始的整个生产路线时,目前的策略在至少一个反应步骤中存在较差的区域选择性或化学选择性。这项工作提出了一种通过相应的醛肟合成脂肪伯胺的有效且选择性的方案。这些很容易由羟胺和相应的醛缩合产生。这种简单的缩合可以用分离的醛或用来自烯烃加氢甲酰化的粗反应溶液进行。它可以通过沉淀直接分离醛肟,然后作为最终还原的中间体。在新开发的醛肟还原方案中,来自几种不同醛肟的所需伯胺的收率高达 90%。钌/三磷催化剂体系的活性超过7500 h -1,明显快于其他胺化方案,并且在几分钟内实现完全转化。我们的方法允许通过加氢甲酰化、缩合、还原顺序从不饱和、可再生油脂化学品 10-十一烯酸甲酯合成聚酰胺-12 前体(12-氨基十二烷酸甲酯),合成规模高达 6 g,总体选择性高达 68%。
Iron-catalyzed synthesis of benzoxazoles by oxidative coupling/cyclization of phenol derivatives with benzoyl aldehyde oximes
An iron-catalyzed oxidativecoupling/cyclization reaction for the synthesis of benzoxazoles at room temperature is reported. This reaction was enabled by an inexpensive iron(III) catalyst by treating readily available phenol derivatives with benzoyl aldehyde oximes. Mechanistic studies show that benzoyl aldehyde oxime is not only used as a substrate, but also serves as an ancillary ligand to support
Conversion of Oximes to Carbonyl Compounds by Triscetylpyridinium Tetrakis(oxodiperoxotungsto) Phosphate (PCWP)-mediated Oxidation with Hydrogen Peroxide
Aromatic and aliphatic oximes have been deoximated in chloroform-water to the corresponding aldehydes with dilute hydrogenperoxide and triscetylpyridinium tetrakis (oxodiperoxotungsto) phosphate as catalyst. The presence of dipolarophiles in the reaction mixtures allows a competitive reaction that converts oximes into isoxazole and isoxazoline derivatives via the intermediate formation of nitrile