Airgas USA, LLC 1 article published in JoVE Chemistry Facile Preparation of 4-Substituted Quinazoline Derivatives Daniel Z. Wang1, Lesong Yan2, Lingmei Ma1 1School of Science and Computer Engineering, University of Houston-Clear Lake, 2Airgas Specialty Gas, Airgas USA LLC A protocol for facile preparation of 4-substituted quinazoline derivatives from 2-aminobenzophenones, thiourea and dimethyl sulfoxide is presented.