The present work explains electrochemical behavior of some dihydroxybenzoic acid and catechol derivatives (1a-d) in the presence of indole (3) as a nucleophile using cyclic voltammetry and controlled-potential coulometry methods and describes a new electrochemical strategy for the synthesis of some new indolyl derivatives of quinones and catechols. In this work, we derive these products with good yields based on electrochemical oxidation under controlled potential conditions in aqueous solutions, without toxic reagents and solvents at a carbon electrode, using an environmentally friendly method. (c) 2008 Elsevier B.V. All rights reserved.