Development for medicinal chemistry on antitumor isoquinoline marine natural products as lead compound

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In the course of our research on new metabolites, which involves the isolation and characterization of biologically active compounds and the preparation of their respective alnalogues, we can isolate several new marine isoquinolines, such as renieramycin V-Y from blue sponges. The second, we are succeeded to the total syntheses of renieramycin G and cribrstatin 4. Furthermore, many model compounds of the left half of renieramycins were prepared from phenylalanine derivatives. The initial cytotoxicity profiles of natural products and their derivatives along with synthetic analogues are also presented.