Base-mediated one-pot synthesis of 3,4,5,6-tetrahydro-4-substituted benzo[<i>h</i>]quinazoline-2(1<i>H</i>)-thione derivatives and evaluation of their antioxidant activity
ABSTRACT One-pot three-component Beginelli-like reactions of a ketone 1, an aryl aldehyde 2, and thiourea 3 in the presence of sodium hydroxide are described. In this reaction, 3,4,5,6-tertrahydro-4-substituted quinazoline-2(1H)-thionederivatives 4a–h were obtained in good yields (73–85%). The compound 4a has been characterized by single crystal X-ray analysis. All the synthesized compounds 4a–h and