Expeditious Approach to Indoloquinazolinones via Double Annulations of o-Aminoacetophenones and Isocyanates

A novel procedure for a one-pot cascade reaction of o-aminoacetophenones and aryl/aliphatic isocyanates catalyzed/oxidized by the [Pd]/[Ag] system was developed. The reaction involves two C-N bond and one C-C bond formations during the double annulation process and the desired indoloquinazolinones and derivatives were afforded up to 81% yields from readily available substrates with a tolerance of a broad variety.

Automated summary

The paper discusses a novel one-pot cascade reaction catalyzed/oxidized by the [Pd]/[Ag] system, involving two C-N bond and one C-C bond formations during the double annulation process to yield the desired products. The method is applicable to a wide range of readily available substrates and provides high yields.