Solvent-free solid acid-catalyzed electrophilic annelations: A new green approach for the synthesis of substituted five-membered N-heterocycles
An effective microwave-induced, solid acid-catalyzed, environmentally benign synthesis of substituted pyrroles, indoles and carbazoles under solvent-free conditions is described. The new synthetic methodology is based on the use of a considerably strong solid acid, K-10 montmorillonite. Both the cyclialkylation of amines and annelation of pyrroles and indoles have been completed within minutes and provided excellent (75-98%) yields with practically 100% selectivity. © 2006 Wiley-VCH Verlag GmbH & Co. KGaA.
Advanced Synthesis and Catalysis
Solvent-free solid acid-catalyzed electrophilic annelations: A new green approach for the synthesis of substituted five-membered N-heterocycles.
Advanced Synthesis and Catalysis,
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