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The tetracyclic meroterpenoid natural product pelorol was isolated from sponge D.elegans,and has been identified as an activator of the inositol-5-phosphatase SHIP.However,the inadequate quantity of pelorol severely limited its further applications in life science field.Herein,starting from commercially available terpenoid(+)-sclareolide,we have realized the total synthesis of pelorol.Several key steps have been optimized to facilitate the large-scale preparation.