Six-Membered Cyclic Nitroso Acetals: Synthesis and Studies of the Nitrogen Inversion Process of<i>N</i>-Silyloxy-3,6-dihydro-2<i>H</i>-1,2-oxazines
作者:Alexander S. Shved、Andrey A. Tabolin、Roman A. Novikov、Yulia V. Nelyubina、Vladimir P. Timofeev、Sema L. Ioffe
DOI:10.1002/ejoc.201600952
日期:2016.11
The reaction of silyl nitronates and enol diazoacetates affords N‐silyloxy‐3,6‐dihydro‐2H‐1,2‐oxazines as a new type of nitroso acetal. The scope of the reaction was established. Quantum chemical calculations and kinetic data allowed the nitrogen inversionbarrier in the target nitroso acetals to be determined.
甲硅烷基硝酸酯与烯醇重氮乙酸酯的反应提供了N-甲硅烷氧基-3,6-二氢-2 H - 1,2-恶嗪类新型亚硝基缩醛。确定了反应范围。量子化学计算和动力学数据可以确定目标亚硝基缩醛中的氮转化障碍。
Tandem double acylation/[3,3]-rearrangement of aliphatic nitro compounds: a route to α-oxygenated oxime derivatives
作者:Yulia A. Antonova、Yulia V. Nelyubina、Alexey Yu. Sukhorukov、Sema L. Ioffe、Andrey A. Tabolin
DOI:10.1039/c9ob01005j
日期:——
A new tandem double acylation/rearrangement reaction of nitro compounds is described. It has a broad substrate scope allowing the mild and efficient synthesis of α-acyloxy oxime esters in high yields and regioselectivity. According to the obtained data, the mechanism for transformation was proposed. The utility of the obtained α-hydroxy oxime esters was demonstrated.
Tandem [3+2]-cycloaddition/homo-Baldwin rearrangement of silyl nitronates and donor-acceptor cyclopropenes. A novel approach to polysubstituted aziridines starting from nitro compounds
作者:Yana I. Lichtenstein、Ivan S. Golovanov、Sema L. Ioffe、Andrey A. Tabolin
DOI:10.1016/j.tet.2022.132693
日期:2022.3
The synthesis of substituted N-silyloxy aziridines through reaction of silyl nitronates and enol diazo acetates is described. The process involves in situ transformation of enol diazo acetates into donor-acceptor cyclopropenes, their [3 + 2]-cycloaddition with nitronates and subsequent rearrangement of fused isoxazolidine intermediates. Depending on the substrate type, generation of prerequisite cyclopropenes
C-C Coupling of Acyclic Nitronates with Silyl Ketene Acetals under Silyl Triflate Catalysis: Reactivity Umpolung of Aliphatic Nitro Compounds
作者:Vladimir O. Smirnov、Yulia A. Khomutova、Vladimir A. Tartakovsky、Sema L. Ioffe
DOI:10.1002/ejoc.201200239
日期:2012.6
C–C coupling of alkyl and trialkylsilyl nitronates with silyl keteneacetals yields functionalized nitroso acetals. This conversion may serve as a new simple procedure to reverse the conventional reactivity of aliphatic nitro compounds. Preliminary results on the hydrogenation of nitroso acetals into amino acids derivatives, as well as TFA-catalyzed transformations of nitroso acetals, are examined to
Stable gold(III) catalysts by oxidative addition of a carbon–carbon bond
作者:Chung-Yeh Wu、Takahiro Horibe、Christian Borch Jacobsen、F. Dean Toste
DOI:10.1038/nature14104
日期:2015.1
Here we report a carbon–carbon bond cleavage at ambient conditions by a Au(i) complex that generates a stable Au(iii) cationic complex. In contrast to the well-established soft and carbophilic Au(i) catalyst, this Au(iii) complex exhibits hard, oxophilic Lewis acidity. For example, we observed catalytic activation of α,β-unsaturated aldehydes towards selective conjugate additions as well as activation