Synthesis of Substituted Indole from 2-Aminobenzaldehyde through [1,2]-Aryl Shift
作者:Patrick Levesque、Pierre-André Fournier
DOI:10.1021/jo1016713
日期:2010.10.15
of ethyl diazoacetate (EDA) to 2-aminobenzaldehydes cleanly affords the indole core. As opposed to other common approaches for the synthesis of indole, this method displays both excellent functional group tolerance and perfect regiochemical control. This allowed the synthesis of a variety of useful indole buildingblocks from 2-aminobenzaldehydes derived from readily available anthranilic acids.
Chemodivergent Spirocyclization of 2‐Sec‐Aminobenzilidene Imidazolones: Lewis Versus Brønsted Acids Catalysis
作者:Dmitrii S. Ivanov、Elvira R. Zaitseva、Alexander Yu. Smirnov、Dina A. Rustamova、Andrey A. Mikhaylov、Maria A. Sycheva、Darya A. Gluschenko、Nadezhda S. Baleeva、Mikhail S. Baranov
DOI:10.1002/adsc.202200109
日期:2022.4.26
Benzylidene imidazolones with ortho- secondary aminogroup undergo acid-promoted chemodivergent spirocyclization. Strong Lewisacids provide access to spirocyclic tetrahydroquinolines via [1,5]-hydride shift triggered cyclization despite of the presence of free secondary amino group. Brønstedacids promote unprecedented intramolecular umpolung hydroamination reaction with the formation of spirocyclic indolines