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As a main bioactive component extracted from Evodiae fructus, evodiamine has a variety of pharmacological activities. In this paper, evodiamine was chosen as starting material to react with different halides. Upon treatment of TFA, a series of novel ring-opening evodiamine derivatives 3a-o were successfully synthesized in a moderate to high yields. These obtained compounds exhibit a moderate to good antitumor activity against BGC803 and SW480 in vitro test by MTT assay. The results showed that hexyl substituted evodiamine derivative (3j, R=hexyl) has a strong antitumor activity against BGC803 and SW480.