Access to Indoles via Diels–Alder Reactions of 5-Methylthio-2-vinylpyrroles with Maleimides

Noland, W. E.; Lanzatella, N. P.; Dickson, R. R.; Messner, M. E.; Nguyen, H. H. J. Heterocycl. Chem. 2013, 50, 795.