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8098998 
Journal Article 
Synthesis of trifluoromethylindolocarbazoles, novel cyclic 18-membered and 27-membered N-arylmethyldi- and triindoles and an N-arylmethyltetraindolyltrimethane 
Biswas, KM; Saha, A; Mallik, H 
1999 
Yes 
Journal of the Indian Chemical Society
ISSN: 0019-4522 
76 
11-12 
601-606 
English 
5,11-Dihydro-5,11-diarylmethyl-6-trifluoromethylindolo[3,2-b]carbazoles (3b-d) have been synthesised from both N-arylmethylindole-3-carbinols (1b-d) and N,N′-diarylmethyl-3,3′-diindolylmethanes (2b, c and f) by treatment with trifluoroacetic anhydride. The cyclic N-arylmethylindoledi- and trimers (4c-f) and the 3-trifluoroacetylindoles (5a and b) have also been obtained from this reaction. Thermal reaction of 1b-d furnishes 2b, c and f, but 1c also affords the N-arylmethyltriindolyldimethane (2d) and the N-arylmethyltetraindolyltrimethane (2e). The results are discussed and the plausible reaction mechanism is very briefly presented.