An interrupted Ugi reaction enables the preparation of substituted indoxyls and aminoindoles.

@article{Schneekloth2009AnIU,
  title={An interrupted Ugi reaction enables the preparation of substituted indoxyls and aminoindoles.},
  author={John S Schneekloth and Jimin Kim and Erik J Sorensen},
  journal={Tetrahedron},
  year={2009},
  volume={65 16},
  pages={3096-3101}
}
In a variation of the classical Ugi reaction, an acid promoted reaction between imines and isocyanides forms both 3-aminoindoles and substituted indoxyls. A recently reported triflyl phosphoramide is shown to be critical to obtain high yields under mild conditions.