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A series of novel N-1,3-benzo[d]thiazol-2-yl-2-(2-oxo-2H-chromen-4-yl)acetamide derivatives has been synthesized. All the newly synthesized compounds were evaluated for their anti-HIV activity using MTT method. Most of these compounds showed moderate to potent activity against wild-type HIV-1 with an EC(50) ranging from7 EC(50) [μg/ml] to100 EC(50) [μg/ml]. Among them, N-1,3-benzo[d]thiazol-2-yl-2-(2-oxo-2H-chromen-4-yl)acetamide 6v was identified as the most promising compound (EC(50)=7 μg/ml). Among all the compounds, three compounds 6m, 6v and 6u have been exhibits potent anti-HIV activity against MT-4 cells.

A new series of benzofuran-2-yl(4,5-diydro-3,5-substituted diphenylpyrazol-1-yl) methanone derivatives 8a–x by the reaction of the benzofuran-2-carbohydrazides 7 with various chalcone derivatives 3a–x using microwave irradiation has been described. The effect of synthesized compounds 8a–v was studied against human cancer cell lines for their antiproliferative activity and reversal of multidrug resistance on human MDR1-gene transfected mouse lymphoma cells. Among the 24 compounds, the 8c and 8h showed good antiproliferative activity 8b, 8f and 8k were exhibited good MDR reversal activity. The main significance of the process is easy workup process, short reaction time and high yield of the new compounds for biological interest. However, the studies on genetically modified multidrug resistant cancer cells are costly and time consuming.