Borsche-Drechsel Cyclization.
E. Drechsel, J. Prakt. Chem. [2] 38, 69 (1858)
W. Borsche and M. Feise, Ber. 20, 378 (1904)
M. Campbell and B. M. Barclay, Chem. Revs. 40, 361 (1947)
R. Elderfield, Heterocyclic Compounds 3, 298 (New York,1952)
V. Rosnati and G. Pelazzo, Cazz. Chim. Ital. 84, 644 (1954)
Also see Bucherer Carbazole Synthesis , Fischer Indole Synthesis , Piloty-Robinson Pyrrole Synthesis