A Facile and Green Synthesis of 5-(3-methyl-7-substituted-4H-1, 4-benzothiazin-2-yl)-4-aryl-4H-1, 2, 4-triazole-3-thiols under Ultrasound Irradiation
A simple and efficient method has been developed for the rapid synthesis of substituted 4H-1, 4-benzothiazines (3) from 2-aminobenzenethiols (1) and β-ketoester/β-diketones (2) in dry media undermicrowaveirradiation using basic alumina as solidsupport.