Synthesis of 1-aryl-1H-pyrrolo[2,3-b]pyridines (1-aryl-7-azaindoles) by a thermal dehydration-cyclization-dehydrogenation sequence of 2-arylamino-3-(1- hydroxyalkyl)pyridines
1-Aryl-1H-pyrrolo[2,3-b]pyridines (1-aryl-7-azaindoles) have been prepared in reasonable yields from the corresponding 2-arylamino-3-(1-hydroxyalkyl) pyridines, on heating at ca. 250 °C, through a successive dehydration/cyclization/dehydrogenation sequenc