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Cyclization reactions involving cyanoacetylated bisindoles
have been studied, providing access to various novel cyclo
hepta[2,1-
b:3,4-
b']diindole derivatives as well as some relatedfused pentacyclic systems. Treatment of 3-cyanoacetyl-2,3'-diindolylmet
hane wit
h met
hanesulfonic acid gave 6-(cyanomet
hyl)indolo[3,2-
b]carbazole in a good yield.