T. Lipinska et al., 2-(2-pyridyl)indole derivatives preparation via Fischer reaction on montmorillnite K10 zinc chloride under microwave irradiation, SYN COMMUN, 29(8), 1999, pp. 1349-1354
Fischer condensation was performed in 50-60% yield in lower temperatures an
d shorter times if conducted in solvent-free acid medium under microwave ir
radiation.