基于β,δ-三酮与H 2 O 2的酸催化反应,提出了一种组装过氧化物,单过氧缩醛和乙缩醛部分的三环结构的方法。通过使用大量强酸(例如H 2 SO 4,HClO 4或HBF 4)进行反应,选择性生成三环化合物,产率从39%到90%。,它们既充当催化剂,又充当助溶剂。该反应与众不同之处在于,尽管提供环化合物和低聚物的可能的过氧化途径多种多样,但该反应仍以高选择性进行,并通过β位置上的羰基的单过氧化作用和δ-羰基的转化产生三环过氧化物。组成乙缩醛一个。合成物放大至数十克,并且可以容易地从反应混合物中分离出所得的过氧化物。
基于β,δ-三酮与H 2 O 2的酸催化反应,提出了一种组装过氧化物,单过氧缩醛和乙缩醛部分的三环结构的方法。通过使用大量强酸(例如H 2 SO 4,HClO 4或HBF 4)进行反应,选择性生成三环化合物,产率从39%到90%。,它们既充当催化剂,又充当助溶剂。该反应与众不同之处在于,尽管提供环化合物和低聚物的可能的过氧化途径多种多样,但该反应仍以高选择性进行,并通过β位置上的羰基的单过氧化作用和δ-羰基的转化产生三环过氧化物。组成乙缩醛一个。合成物放大至数十克,并且可以容易地从反应混合物中分离出所得的过氧化物。
Preparation of a microsized cerium chloride-based catalyst and its application in the Michael addition of β-diketones to vinyl ketones
作者:Alexander O. Terent'ev、Vera A. Vil'、Ivan A. Yaremenko、Oleg V. Bityukov、Dmitri O. Levitsky、Vladimir V. Chernyshev、Gennady I. Nikishin、Fabrice Fleury
DOI:10.1039/c3nj01454a
日期:——
evaporation of its alcoholic solutions. The way of the preparation of the cerium chloride-based catalyst plays a decisive role in its catalytic activity. This catalyst is efficient in the Michaeladdition of β-diketones to vinyl ketones giving β,δ-triketones.
Inverse α-Effect as the Ariadne’s Thread on the Way to Tricyclic Aminoperoxides: Avoiding Thermodynamic Traps in the Labyrinth of Possibilities
作者:Ivan A. Yaremenko、Yulia Yu. Belyakova、Peter S. Radulov、Roman A. Novikov、Michael G. Medvedev、Nikolai V. Krivoshchapov、Alexander A. Korlyukov、Igor V. Alabugin、Alexander O. Terent′ev
DOI:10.1021/jacs.2c00406
日期:2022.4.27
thermodynamic and kinetic control with a variety of mono-, bi-, and tricyclic structures evolving under the conditions of thermodynamic control until they reach a kinetic wall created by the inverse α-effect, that is, the stereoelectronic penalty for the formation of peroxycarbenium ions and related transition states. Under these conditions, the reaction stops before reaching the most thermodynamically
稳定的三环氨基过氧化物可以通过 β,δ'-三酮、H 2 O 2和 NH 基团源(如氨水或铵盐)的无催化剂三组分缩合选择性组装。这个过程是可扩展的并且可以产生克数量的三环杂环,在一个分子中包含过氧化物、氮和氧循环。令人惊讶的是,尽管有多种替代反应路线,通过过氧化物、半缩醛、单过氧缩醛和过氧半缩醛官能团的平衡,这种复杂的三环分子仍然可以选择性地形成!该反应由 H 2 O 2的“立体电子挫折”引发并将热力学和动力学控制元素与在热力学控制条件下演化的各种单环、双环和三环结构相结合,直到它们达到由逆α效应产生的动力学壁,即立体电子罚分过氧碳鎓离子和相关过渡态的形成。在这些条件下,在三个不同的杂环在无环前体框架上组装和融合的阶段,反应在达到最热力学稳定的产物之前停止。
Approach for the Preparation of Various Classes of Peroxides Based on the Reaction of Triketones with H<sub>2</sub>O<sub>2</sub>: First Examples of Ozonide Rearrangements
作者:Ivan A. Yaremenko、Alexander O. Terent'ev、Vera A. Vil'、Roman A. Novikov、Vladimir V. Chernyshev、Viktor A. Tafeenko、Dmitri O. Levitsky、Fabrice Fleury、Gennady I. Nikishin
DOI:10.1002/chem.201402594
日期:2014.8.4
tetraoxanes, the peroxide ring is formed by the reaction of hydrogen peroxide with two carbonyl groups at the β positions. The synthesis of ozonides from ketones and hydrogen peroxide is a unique process in which the ozonide ring is formed with the participation of two carbonyl groups at the δ positions. Rearrangements of ozonides were found for the first time after more than one century of their active
β,δ-三酮与H 2 O 2的醚溶液反应在极性非质子助溶剂存在下由杂多酸催化可通过三种途径形成三类过氧化物:三环一过氧化物,桥联四恶烷和一对立体异构的臭氧化物。该反应是不寻常的,其产生桥连的四恶烷和臭氧化物,其中三个羰基之一保持完整。在桥联四恶烷的合成中,过氧化物环是由过氧化氢与β位上的两个羰基反应形成的。由酮和过氧化氢合成恶臭化物是一种独特的过程,其中恶臭化物环是在δ位上两个羰基的参与下形成的。经过一个多世纪的积极研究,首次发现了臭氧化物的重排。臭氧化物彼此相互转化,并重排为三环一过氧化物,而臭氧化物和三环一过氧化物则转变为桥联四恶烷。通过柱色谱分离各个反应产物,并通过NMR光谱,质谱和元素分析对其进行表征。X射线衍射表征了每种过氧化物的代表。
Boron Trifluoride as an Efficient Catalyst for the Selective Synthesis of Tricyclic Monoperoxides from β,δ-Triketones and H2O2
Boron trifluoride was found to serve as an efficient catalyst for the reaction of beta,delta-triketones with H2O2 producing tricyclic monoperoxides in yields from 48-93%. BF3 acts simultaneously as a catalyst and co-solvent. The synthesis can be scaled up to tens of grams. The resulting peroxides can be easily isolated from the reaction mixture by column chromatography.
Synthesis of peroxides from β,δ-triketones under heterogeneous conditions
作者:A. O. Terent’ev、I. A. Yaremenko、A. P. Glinushkin、G. I. Nikishin
DOI:10.1134/s1070428015120027
日期:2015.12
Heterogeneous reactions of beta,delta-triketones with ethereal hydrogen peroxide in nonpolar solvents, catalyzed by phosphomolybdic acid, afforded mixtures of stereoisomeric ozonides, tricyclic monoperoxides, and bridged tetraoxanes. The trioxolane ring is formed by the carbonyl groups located in the delta-position with respect to each other.