Five-membered nitrogen containing heterocycles, such as pyrroles, indoles, and carbazoles are important building blocks in an extensive number of biologically active compounds. The importance of these heterocycles provides significance and actuality for developing new methods for their syntheses. Due to strengthening environmental regulations and safety concerns the development of environmentally responsible synthetic methods are also highly desirable. Herein, we report an effective microwave induced solid acid catalyzed environmentally benign synthesis of substituted pyrroles, indoles and carbazoles under solvent-free conditions. The new synthetic methodology is based on the use of a 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. This methodology has been successfully extended for the synthesis of N-sulfonyl pyrroles using different dicarbonyl compounds.