Nucleoside analogues show a variety of biological activities. To prepare new purine nucleoside analogues that could inhibit the proliferation of tumor cells and resist enzyrne hydrolysis, we designed and synthesized 15 different L-5＇noraristeromycin analogues, in which thioether, sulfoxide or sulfone function was introduced to replace the 5＇-hydroxymethyl group. Their anti-tumor activities were assayed in vitro. One compound showed potent anti-tumor activity.
