Versatile Indole Synthesis by a 5-endo-dig Cyclization Mediated by Potassium or Cesium Bases We thank the DFG (Leibniz-Programm) and the Fonds der Chemischen Industrie for generous financial support. A.L.R. and C. K. thank the Humboldt-Foundation and the BASF AG, respectively, for fellowships. W.D. was supported by the BMBF program (03 D 0056 2). We thank Dr. J. Henkelmann (BASF AG) for helpful discussions and the BASF AG for the generous gift of chemicals.