PANI-HBF<sub>4</sub>: A Reusable Polymer-Based Solid Acid Catalyst for Three-Component, One-Pot Synthesis of 3-Substituted Amino Methyl Indoles Under Solvent-Free Conditions
Abstract A simple, fast, efficient, high-yielding, and green process is developed for one-pot, three-componentsynthesis of 3-substituted amino methyl indolesundersolvent-freeconditions using polyaniline salt as polymer-based reusable solid acid catalyst at room temperature. The advantages of polyaniline salt catalyst are ease of synthesis and handling, low cost, versatality, and recyclability.