Camphor sulfonic acid (CSA) is found to be a low cost, readily available and efficient non-metallic catalyst for the electrophilic substitution reaction of a substituted indole with various isatins and aryl aldehydes in 30% MeCN-H2O solvent to afford the corresponding 3,3-diaryloxindoles and bis(indol-3-yl) methanes with higher yields under room temperature. This new procedure has remarkable features such as experimental simplicity, less expensive, high conversions, good to excellent yields, shorter reaction times and simple work up procedures.