Key influence of the nature of the substituent in the propynal molecule on the outcome of its reaction with vicinal di(N-hydroxyamine)
作者:E. V. Tretyakov、G. V. Romanenko、D. V. Stass、A. V. Mareev、A. S. Medvedeva、V. I. Ovcharenkoa
DOI:10.1007/s11172-008-0094-8
日期:2008.3
The reaction of propynals X-C≡C-CHO, where X = Alk or Ar, with 2,3-di(N-hydroxyamino)-2,3-dimethylbutane gives exclusively 1-X-2-(1-hydroxy-4,4,5,5-tetramethylimidazolidin-2-ylidene)ethanones. In the case of X = Me3Si, the reaction affords 2-(2-trimethylsilylethynyl)-4,4,5,5-tetramethylimidazolidine-1,3-diol. The reaction of propynal containing X = Et3Ge yields both types of the products. The resulting imidazolidine-1,3-diol can be quantitatively isomerized to imidazolidin-2-ylideneethanone, oxidized to 2-[2-(triethylgermyl)ethynyl]-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl, or transformed into ethynyl-substituted nitronyl nitroxide.
丙炔醛X-C≡C-CHO(其中X = 烷基或芳基)与2,3-二(N-羟基氨基)-2,3-二甲基丁烷反应,仅生成1-X-2-(1-羟基-4,4,5,5-四甲基咪唑啉-2-亚基)乙酮。在X = 三甲基硅基的情况下,反应得到2-(2-三甲基硅基乙炔基)-4,4,5,5-四甲基咪唑啉-1,3-二醇。含有X = 三乙基锗的丙炔醛反应生成两种类型的产物。所得的咪唑啉-1,3-二醇可以定量异构化为咪唑啉-2-亚基乙酮,氧化为2-[2-(三乙基锗基)乙炔基]-4,4,5,5-四甲基-4,5-二氢-1H-咪唑-3-氧化物-1-氧基,或转化为乙炔基取代的氮氧自由基。