A new series of p -benzoquinones, hydroquinones, and quinol dimethyl ethers substituted by a pyrazole ring either directly or after an oxoethyl linker was synthesized and screened for in vitro cytotoxic activity. Compounds 8d, f, g, i, and 9c, f, and 13c exhibited broad-spectrum activity (GI50 MG-MID values 9.27–14.72 μM). With regard to sensitivity, compounds 8f and 9c, f have proved to possess a