6, 7-Methylenedioxy (or 5-hydroxy-6-methoxy)-2-(substituted selenophenyl) quinolin-4-ones and their isosteric compounds were synthesized and evaluated for anticancer activity. Structure–activity relationships (SAR) of these compounds were established. Among all tested compounds, 6, 7-methylenedioxy-2-(5-methylselenophen-2-yl) quinolin-4-one (4d) was found to be the most promising anticancer agent. In screening against NCI's 60 ...