The Chemistry of<i>N</i>,<i>N</i>-Bis(siloxy)enamines. Part 8.A General Method for the Preparation of α-Azido Oximes from Aliphatic Nitro Compounds
作者:Alexey V. Lesiv、Sema L. Ioffe、Alexey Yu. Sukhorokov、Igor V. Bliznets、Yulija A. Khomutova、Yuriy A. Strelenko
DOI:10.1055/s-2005-861836
日期:——
A new convenient procedure for the preparation of a variety of α-hydroxy oximes from available aliphatic nitro compounds via intermediate N,N-bis(siloxy)enamines is presented. The mechanism of the key step, the rearrangement of N,N-bis(siloxy)enamines, is discussed.
Michael Addition of P-Nucleophiles to Conjugated Nitrosoalkenes
作者:Yana A. Naumovich、Sema L. Ioffe、Alexey Yu. Sukhorukov
DOI:10.1021/acs.joc.9b00924
日期:2019.6.7
oxides, phosphine–borane complexes, and phosphonium salts) was developed. The strategy exploits hitherto unknown Michaeladdition of PH-containing compounds (diphenylphosphine oxide, diisopropyl phosphite, phosphine–borane complexes, and triphenylphosphonium bromide) to unstable conjugated nitrosoalkenes, which are generated in situ from corresponding nitrosoacetals. The resulting α-phosphorus-substituted
Chemistry of N,N-bis(silyloxy)enamines 7. Quaternization of tertiary amines and nitrogen-containing heterocycles by N,N-bis(silyloxy)enamines
作者:A. V. Lesiv、S. L. Ioffe、Yu. A. Strelenko、V. M. Danilenko
DOI:10.1007/s11172-005-0106-x
日期:2004.10
Coupling of N,N-bis(silyloxy)enamines with tertiary amines and nitrogen-containing heterocycles affording the corresponding functionalized ammonium or iminium salts was studied. The area of its application was determined, and optimal procedures for the synthesis of the target products were proposed. The mechanism including the formation of conjugated nitroso alkene or a silylnitrosonium cation as key
A first general approach to the synthesis of unsymmetrically substituted tris(β-oximinoalkyl)amines containing two or three different β-oximinoalkyl fragments has been developed. This procedure employs available aliphatic nitro compounds as starting building blocks and their silylation as the key step. This approach provides an efficient strategy for the diversity-oriented synthesis of 1,4,6,10-tetraazaadamantane
Aliphatic nitro compounds can be considered as good precursors of a wide variety of alpha-azolyl-substituted oximes. The double silylation of convenient aliphatic nitro compounds and the subsequent N,C-coupling of the resulting N,N-bis(silyloxy)enamines 3 with N-silylated azoles 4 lead to the formation of the silylated alpha-azolyl-substituted oximes 6, which can be smoothly desilylated to give the target a-azolyl-substituted oximes 5. The mechanism of the key step of this process -N,C-coupling - includes the generation of corresponding conjugated nitrosoalkenes 7 (Schemes 4 and 5). The contribution of the chain mechanism in the overall process is considered as well. The studies of the scope and limitations of this reaction, as well as the optimization of its conditions were accomplished. The configuration of the C=N bond in oximes was established by NMR.