A four-component procedure for the preparation of substituted quinazolines from anilines, aromatic aldehydes and ammonium iodide is described. The C–H bond ortho to the amino group in anilines was directly functionalized under metal-free conditions. Two aldehydes were involved in this reaction and ammonium iodide was used as one of the nitrogen sources. This reaction provides a strategy for the facile construction of substituted quinazolines from simple anilines and other readily available reactants.