Unique Structural Properties of 2,4,6-Tri-<i>tert</i>-butylanilide: Isomerization and Switching between Separable Amide Rotamers through the Reaction of Anilide Enolates
作者:Shiori Tsukagoshi、Nobutaka Ototake、Yusuke Ohnishi、Mayu Shimizu、Osamu Kitagawa
DOI:10.1002/chem.201300201
日期:2013.5.17
report a unique structural property of 2,4,6‐tri‐tert‐butylanilide, which can be separated into its amide rotamers at room temperature. Interconversion between the rotamers of anilide enolates occurs readily at room temperature and their reaction with electrophiles gives mixtures of the rotamers in a ratio that depends on the reactivity of the corresponding electrophile. That is, the reaction of the
在此,我们报道了2,4,6-三叔丁基苯胺的独特结构性质,可以在室温下将其分离成酰胺旋转异构体。苯胺基烯酸酯的旋转异构体之间的互变在室温下容易发生,并且它们与亲电试剂的反应以取决于相应的亲电试剂的反应性的比率给出了旋转异构体的混合物。就是说,2,4,6-三叔丁基乙酰苯胺烯酸酯与反应性亲电试剂(如烯丙基溴或质子酸)的反应生成了以E酰胺为主要成分的苯胺旋转异构体的混合物。反应性亲电试剂(例如1-溴丙烷和2-碘丙烷)可生成旋转异构体的混合物,其中Z旋转异构体是主要成分。产物的旋转异构体比率也强烈地取决于苯胺化物烯醇化物的反应性。苯胺旋转异构体之间的切换可以通过反应性较低的质子酸对反应性较低的烯醇化物进行质子化和苯胺化物的热异构化来实现。