A General Metal-Assisted Synthesis of α-Halo Oxime Ethers from Nitronates and Nitro Compounds
作者:Alexey Yu. Sukhorukov、Maria A. Kapatsyna、Tammy Lim Ting Yi、Hyeong Ryool Park、Yana A. Naumovich、Petr A. Zhmurov、Yulia A. Khomutova、Sema L. Ioffe、Vladimir A. Tartakovsky
DOI:10.1002/ejoc.201403083
日期:2014.12
α-halo oximeethersfrom readily accessible nitronates and nitro compounds via bis(oxy)enamines is reported. A key step of the strategy involves the unprecedented reaction of bis(oxy)enamines with a metal (Co, Zn, Mg, Mn) halide that acts as both a promoter and halide (Br, I, Cl) source. A variety of cyclic and acyclic ethers of α-halo oximes, including previously unavailable trimethylsilyl ethers of α-iodo
Reaction of N,N-Dioxyenamines with Anhydrides of Carboxylic and Sulfonic Acids; A New Method for the Synthesis of α-Hydroxyoxime Derivatives
作者:Alexey Lesiv、Andrey Tabolin、Sema Ioffe
DOI:10.1055/s-0029-1216907
日期:2009.9
The reactions of N,N-dioxyenamines with carboxylic and sulfonic acid anhydrides were investigated. A newmethod for the synthesis of α-hydroxyoxime derivatives via the reaction of N,N-dioxyenamines with trifluoroacetic anhydride is described. 1,2-oxazine - trifluoroacetic anhydride - hydroxyoxime - enamine - rearrangement
Tandem Deoxygenation/Halogenation of <i>N</i>
-Oxides Under Acylation Conditions: Scope and In Situ IR Spectroscopic Study
作者:Roman S. Malykhin、Ivan S. Golovanov、Sema L. Ioffe、Alexey Yu. Sukhorukov
DOI:10.1002/ejoc.201900131
日期:2019.7.14
Unusual acylation of 1,2‐oxazine N‐oxides with acyl bromides produces 3‐bromomethyl‐substituted 2H‐1,2‐oxazines via the formation of molecular bromine as intermediate. The developed process was successfully exploited in the stereoselective synthesis of pharmaceutically relevant molecules.
1,2-恶嗪N-氧化物与酰基溴的不寻常酰化反应会通过形成分子溴作为中间体来生成3-溴甲基-取代的2 H - 1,2-恶嗪。所开发的方法已成功地用于药物相关分子的立体选择性合成中。
A Convenient Procedure for the Synthesis of 3-Substituted 5,6-Dihydro-4<i>H</i>-1,2-oxazines from Nitroethane
A novel and efficient four-step procedure for the synthesis of C-3-functionalised 5,6-dihydro-4H-1,2-oxazines from nitroethane is described. It includes preparation of 3-methyl-substituted six-membered cyclic nitronates, 3-(bromomethyl)-substituted 5,6-dihydro-4H-1,2-oxazines as intermediates, and nucleophilic substitution of bromine. Total yields of the target C-3-functionalised oxazines are 15-30%
Interrupted Nef Reaction of Cyclic Nitronates: Diastereoselective Access to Densely Substituted α-Chloronitroso Compounds
作者:Roman S. Malykhin、Yaroslav D. Boyko、Yulia V. Nelyubina、Sema L. Ioffe、Alexey Yu. Sukhorukov
DOI:10.1021/acs.joc.2c02281
日期:2022.12.16
The reaction of cyclic nitronic esters (isoxazoline- and 5,6-dihydro-4H-1,2-oxazine-N-oxides) with hydrochloric acid affords geminal chloronitroso compounds bearing a distant hydroxyl group. The reaction is usually diastereoselective, and in some cases stereodivergent formation of isomers at different temperatures is observed. The discovered process represents the first example of an interrupted Nef