作者:Angelo Alberti、Paola Astolfi、Patricia Carloni、Dietrich Döpp、Lucedio Greci、Corrado Rizzoli、Pierluigi Stipa
DOI:10.1016/j.tet.2011.06.094
日期:2011.9
A number of 3-hydroxy substituted indolic nitrones were found to quantitatively photorearrange to (2-benzoylamino)phenyl ketones upon UV-A irradiation. EPR-Spin Trapping experiments suggest that the process, which is believed to proceed via the formation of an oxaziridine, follows a homolytic pathway. Although DFT calculations do not allow to totally exclude alternative routes involving singlet intermediates
发现许多3-羟基取代的吲哚腈在UV-A辐射下定量地光重新排列为(2-苯甲酰基氨基)苯基酮。EPR-Spin诱捕实验表明,该过程被认为是通过恶唑烷的形成而进行的,该过程遵循均溶途径。尽管DFT计算不允许完全排除涉及单重态中间体的替代路线,但它们确实为拟议的均溶机理提供了支持,该机理将由恶唑烷开环后的1,5-氢转移驱动。当通过3-OH基团的甲基化使氢转移变得不可能时,分离出苯并恶嗪作为唯一的反应产物。