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
Reactions of silyl nitronates with dimethylformamide dimethyl acetal as a new general procedure for the synthesis of 2-nitroenamines
作者:Alexander S. Shved、Andrey A. Tabolin、Yulia A. Khomutova、Sema L. Ioffe
DOI:10.1016/j.tetlet.2014.09.071
日期:2014.11
Silyl nitronates obtained in situ from the corresponding aliphatic nitro compounds react with dimethylformamide dimethyl acetal giving 2-nitroenamines in moderate to good yields. The reaction pathway is discussed.
The nef reaction on trialkylsilyl nitronates promoted by m-chloroper-benzoic acid. An efficient route to α-alkoxyketones from nitroalkanes.
作者:J.M. Aizpurua、M. Oiarbide、C. Palomo
DOI:10.1016/s0040-4039(00)96730-3
日期:1987.1
Enantioselective Aldehyde α-Nitroalkylation via Oxidative Organocatalysis
作者:Jonathan E. Wilson、Anthony D. Casarez、David W. C. MacMillan
DOI:10.1021/ja904504j
日期:2009.8.19
The first enantioselective organocatalytic alpha-nitroatkylation of aldehydes has been accomplished. The aforementioned process involves the oxidative coupling of an enamine intermediate, generated transiently via condensation of an amine catalyst with an aldehyde, with a silyl. nitronate to produce a beta-nitroaldehyde. Two methods, one that furnishes the syn beta-nitroaldehyde and a second that provides access to the anti isomer, have been developed. Data are presented to support a hypothesis that explains this phenomenon in terms of a silyl group-controlled change in mechanism. Finally, a three-step procedure for the synthesis of both syn- and anti-alpha,beta-disubstituted beta-amino acids is presented.
Keller, Thomas H.; Yelland, Lois J.; Benn, M. H., Canadian Journal of Chemistry, 1984, vol. 62, p. 437 - 440