Wj. Smith et Js. Sawyer, An SNAr-based preparation of 1-(2-, 3-, and 4-pyridyl)indoles using potassium fluoride/alumina, HETEROCYCLE, 51(1), 1999, pp. 157-160
The reaction of indole with 2-, 3-, and 4-halopyridines in the presence of
potassium fluoride/alumina and 18-crown-6 in DMSO at 120 degrees C is effec
tive in producing 1-(2-, 3-, and 4-pyridyl)indoles in moderate to good yiel
ds.