paired, everted scent brushes (coremata). The R configurationat the asymmetric center (C-7) is common toboth the alkaloidal precursor and the pheromone product.Remarkably, the Asian arctiid moth, Creatonotos transiens(Walker) converts the plant alkaloid heliotrine,which has the opposite (S) configuration at C-7 to (7R)-hydroxydanaidal (Bell et al., 1984; Bell and Meinwald,1986; Schulz et al., 1993) (Fig. 1). The biosynthesis isachieved by selective oxidation of the 7S precursor to theketone followed by reduction to the (7R)-epiheliotrinefollowed by aromatization, hydrolysis, and oxidation toR-hydroxydanaidal (Schulz et al., 1993) (Fig. 1). Thesequestration of pyrrolizidine alkaloids for pheromonaland other functions appears to be widespread among the
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