Cs. Cho et al., RUTHENIUM-CATALYZED SYNTHESIS OF INDOLES FROM ANILINES AND TRIALKANOLAMINES IN THE PRESENCE OF TIN(II) CHLORIDE DIHYDRATE, Chemical communications, (9), 1998, pp. 995-996
Anilines react with trialkanolamines in dioxane in the presence of a c
atalytic amount of a ruthenium catalyst together with tin(II) chloride
dihydrate to give the corresponding indoles in moderate to good yield
s.