their relatedcompounds, including 2- benzylbenzofuran-3(2H)-ones and 2-benzylbenzofurans, were designed and synthesized. Their antiproliferativeactivities were evaluated against human gastric cancer (SGC-7901), human fibrosarcoma (HT-1080) and human oral epidermoid carcinoma (KB) cell lines in vitro. Preliminary results showed that some polyoxo 2-benzyl-2,3-dihydrobenzofurans and their related compounds