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
Acid-catalysed rearrangements. Specific syntheses of 2,3-disubstituted indoles and N-hydroxyindoles
作者:Corrado Berti、Lucedio Greci、Marino Poloni
DOI:10.1039/p19810001610
日期:——
the nitrogen atom does not affect the final products, which are the same for the two diastereoisomeric indolines. The migratory power follows the sequence benzyl > phenyl > alkyl. The resulting 2,3-disubstituted indoles and N-hydroxyindoles were obtained in quantitative yield.