Cascade Reactions of Me3Si-Substituted Imidazolidine-1,3-Diols with PbO2, Including Oxidation of the Corresponding Diol and Subsequent Elimination of the Trimethylsilyl Fragment
作者:Eugene Tretyakov、Galina Romanenko、Vladimir Ikorskii、Dmitry Stass、Vladimir Vasiliev、Maria Demina、Alexander Mareev、Alevtina Medvedeva、Elena Gorelik、Victor Ovcharenko
DOI:10.1002/ejoc.200700113
日期:2007.8
trans isomers 3a and 3b. X-ray investigation of 3a and 3b confirmed that the reaction is regiospecific. Static magnetochemical measurements detected weak exchange interactions between the odd electrons of the paramagnetic centers in the solid nitronyl nitroxide products, including H11 whose crystals consist of helices formed by numerous intermolecular H bonds. The ESR spectra of 3a, 3b, and H11 show
发现 2-Me3Si-R-取代的(Si-C-sp 或 Si-C-sp(2))咪唑烷-1,3-二醇与甲醇中的 PbO2 的反应是级联反应,涉及咪唑烷的氧化- 1,3-二醇转化为硝酰基氮氧化物 (NN-R-SiMe3) 并进一步消除 Me3Si 基团以得到 NN-RH。通过参考 2-ethynyl-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide-1 的合成证明了一锅法合成硝酰基氮氧化物的效率-oxyl (2), 2-(4-ethynylphenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl (8), (E)-4 ,4,5,5-四甲基-2-[2-(pyrrolidin-1-yl)vinyl]-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl