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Karthik, M.; Magesh, C.J.; Perumal, P.T.; Palanichamy, M.; Arabindoo, Banumathi; Murugesan, V.
Applied catalysis. A, General, 05/2005, Letnik: 286, Številka: 1Journal Article
Electrophilic substitution of indoles with carbonyl compounds was carried out over HY, Hβ and H-ZSM-5 zeolites as effective heterogeneous catalysts. These zeolites afford good to excellent yield of bis(indolyl)methanes at room temperature. Vibrindole A, a novel beneficial compound, has been successfully synthesised for the first time in the presence of zeolite in good yield. The yield of bis(indolyl)methanes increases in the order H-ZSM-5 < Hβ < HY, which is in accordance with the acid site density of the catalyst. The catalysts can be reused five times without any loss in catalytic activity.
