Rearrangement of 3-alkylidene-2-siloxy-tetrahydro-1,2-oxazines (ASENA). A new approach toward the synthesis of 3-α-hydroxyalkyl-5,6-dihydro-4H-1,2-oxazines
摘要:
A new approach toward the synthesis of 3-alpha-hydroxyalkyl-5,6-dihydro-4H-1,2-oxazines 1 from available 5,6-dihydro-4H-1,2-oxazine N-oxides 2 has been described. The key step of the process-the rearrangement of 3-alkiliden-2-siloxy-tetrahydro-1,2-oxazines 3 (ASENA)-was thoroughly investigated. Optimal experimental conditions were developed. A possible pathway of the ASENA rearrangement was proposed. (C) 2009 Elsevier Ltd. All rights reserved.
In Situ Generated Magnesium Cyanide as an Efficient Reagent for Nucleophilic Cyanation of Nitrosoalkenes and Parent Nitronates
作者:Pavel Yu. Ushakov、Andrey A. Tabolin、Sema L. Ioffe、Alexey Yu. Sukhorukov
DOI:10.1002/ejoc.201801761
日期:2019.3.7
In situ generated magnesium cyanide is a convenient, readily available, non‐volatile and organic‐soluble reagent for hydrocyanation reactions. Efficient nucleophilic cyanation of π‐electrophiles such as nitronates, conjugated nitrosoalkenes, imines, α,β‐unsaturated ketones, methylenemalonates and azoalkenes was demonstrated.
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
Metal-assisted addition of a nitrate anion to bis(oxy)enamines. A general approach to the synthesis of α-nitroxy-oxime derivatives from nitronates
作者:Yana A. Naumovich、Victoria Emily Buckland、Dmitry A. Sen'ko、Yulia V. Nelyubina、Yulia A. Khoroshutina、Alexey Yu. Sukhorukov、Sema L. Ioffe
DOI:10.1039/c6ob00388e
日期:——
The synthesis of α-nitroxy-substituted oxime derivatives has been achieved by an unprecedented metal-assisted addition of a nitrate anion to bis(oxy)enamines, which are readily available from nitronates or nitroalkanes. The method has a broad scope and provides access to α-nitroxy-oximes and their cyclic ethers including nitroxy-substituted isoxazolines and dihydro-1,2-oxazines, which are of interest