Abstract
Synthesis of various substituted cyclo[b]indoles has been accomplished by using a combined catalytic system of phosphated zirconia (P-Zr) and Bi(NO3)3.5H2O. However, the use of Bi(NO3)3.5H2O or P-Zr separately as heterogeneous acid catalysts generated 2,2'-diindolylpropanes (DIPs) as a major product. The reactions were carried out under mild reaction conditions and required less time. The catalysts applied for the reaction were reusable. Substituted cyclo[b]indoles and several 2,2'-diindolylpropanes are synthesized by using various indoles and ketones.
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