applied for the first time to the direct conversion of N−H and O−H bonds into N‐ and O‐centred radicals, enabling a general and selective oxidative radical oxyamination and dioxygenation of various β,γ‐unsaturated hydrazones and oximes. In the reaction, O2 was employed not only as a terminal oxidant but also as the oxygen source. This protocol provided efficient access to the synthesis of various synthetically
N‐Chlorosuccinimide‐Promoted One‐Pot Synthesis of Substituted 4,5‐Dihydroisoxazole‐5‐methanols in Aqueous Medium
作者:Yunfei Jia、Keyume Ablajan
DOI:10.1002/adsc.202200999
日期:2023.1.24
reaction of aldoximes and allyl alcohol in the presence of K2CO3 at room temperature via a one-pot route. The reaction was achieved in water medium to introduce a low-cost direct protocol for synthesizing isoxazolines. This method offers advantages including the use of an oxidant-free and transitionmetal-free approach, broad scope of allyl alcohol and aldoxime substrates, room-temperature reaction
在此,提出了一种无催化剂合成4,5-二氢异恶唑-5-甲醇的方法,即在K 2 CO 3存在下,通过NCS介导的醛肟和烯丙醇的1,3-偶极环加成反应构建异恶唑啉。在室温下通过一锅法。该反应在水介质中实现,引入了一种低成本的直接合成异恶唑啉的方案。该方法的优点包括使用无氧化剂和无过渡金属的方法、广泛的烯丙醇和醛肟底物、室温反应、良好至更高的产率 (42–92%) 以及克-尺度合成。
Rhodium(<scp>iii</scp>)-catalyzed annulation of arenes with alkynes assisted by an internal oxidizing N–O bond
作者:Zisong Qi、Guo-Dong Tang、Cheng-Ling Pan、Xingwei Li
DOI:10.1039/c5ob01886b
日期:——
Rh(III)-catalyzedC–Hactivation of 3-aryl-dihydroisoxazoles in the coupling with diarylacetylenes has been developed under redox-neutral conditions. This reaction occurred under mild conditions with no by-product, and the N–O bond functions as an oxidizing directinggroup, leading to efficient synthesis of isoquinolines functionalized with a proximal secondary alcohol.
Green Organocatalytic Synthesis of Isoxazolines via a One-Pot Oxidation of Allyloximes
作者:Ierasia Triandafillidi、Christoforos G. Kokotos
DOI:10.1021/acs.orglett.6b03380
日期:2017.1.6
A green, sustainable, organocatalytic, and efficient synthesis of isoxazolines from allyloximes was developed. A 2,2,2-trifluoroacetophenone-catalyzed oxidation of allyloximes, utilizing H2O2 as the green oxidant, was taken advantage of in order to introduce a cheap and environmentally friendly protocol for the synthesis of substituted isoxazolines. A variety of substitution patterns, both aromatic
从烯丙基肟开发了一种绿色,可持续,有机催化和高效的异恶唑啉合成方法。利用H 2 O 2作为绿色氧化剂,利用2,2,2-三氟苯乙酮催化的烯丙基肟的氧化反应,以引入廉价且环境友好的方法合成取代的异恶唑啉。芳香族和脂肪族部分的各种取代方式都具有良好的耐受性,从而导致异恶唑啉的产率中等至优异。