A series of novel 4, 5-dihydropyrazole derivatives (3a–3t) containing hydroxyphenyl moiety as potential V600E mutant BRAF kinase (BRAFV600E) inhibitors were designed and synthesized. Docking simulation was performed to insert compounds 3d (1-(5-(5-chloro-2- hydroxyphenyl)-3-(p-tolyl)-4, 5-dihydro-1H-pyrazol-1-yl) ethanone) and 3m (1-(3-(4- chlorophenyl)-5-(3, 5-dibromo-2-hydroxyphenyl)-4, 5-dihydro-1H-pyrazol-1-yl) ethanone) ...