The use of samarium or sodium iodide salts as an alternative for the aza-Henry reaction
作者:Humberto Rodríguez-Solla、Carmen Concellón、Noemí Alvaredo、Raquel G. Soengas
DOI:10.1016/j.tet.2011.12.061
日期:2012.2
A novel reaction of bromonitromethane with a variety of imines in very mild conditions promoted by SmI2 and NaI to afford nitroamines or bromonitroamines is described. When these reactions were performed on sugar-based imines, the corresponding nitroamines or bromonitroamines were obtained in high yields and from moderate to good stereoselectivities. Synthetic possibilities of nitroamines were also
描述了由SmI 2和NaI促进的在非常温和的条件下溴硝基甲烷与各种亚胺的新颖反应,以提供硝基胺或溴硝基胺。当对基于糖的亚胺进行这些反应时,以高收率和中等至良好的立体选择性获得了相应的硝胺或溴硝胺。硝基胺在室温下在吡咯烷存在下用SmI 2 / H 2 O还原也显示出合成的可能性。提出了这种新颖的氮杂-亨利反应的机理。
Iodoamidation of olefins with chloramine salts and iodine in aqueous media
作者:Satoshi Minakata、Junpei Hayakawa
DOI:10.1039/c0cc03855e
日期:——
An efficient, unique, and convenient method for the iodoamidation of olefins with chloramine salts and I(2) in aqueousmedia is described. This method was applicable to a wide range of olefins, including aromatic, aliphatic, and electron-deficient olefins.
New ureas containing glycosyl and diphenylphosphinyl scaffolds: synthesis and the first attempts to use them in asymmetric synthesis
作者:Stanisław Porwański
DOI:10.1016/j.carres.2014.04.015
日期:2014.7
Chiral ureas containing glycosyl and diphenylphosphinyl scaffolds were found to be an effective organocatalyst. They were synthesised in high yields by a one-pot tandem Staudinger/aza-Wittig coupling reaction. The first attempts of using them in asymmetric synthesis are presented. Yields of the Morita-Baylis-Hillman reaction were moderate with an enantiomeric excess of up to 80%.
Using dimethyl sulfoxide (DMSO) under the influence of molecular sieves (MS) 4A the aza-Henry reaction of various N-tosylimines with nitroalkanes proceeded smoothly to afford β-nitroamines in high ...
The N,N‘-dioxide−Cu(I) complexes have been developed to catalyze the addition of nitromethane to N-tosyl aldimines. The aza-Henryreaction proceeds smoothly affording the corresponding nitro amines in good yields with high enantioselectivities. A catalytic cycle is proposed to explain the origin of reactivity.