Structure-activity relationships of phenyl- and benzoylpyrroles.

Antitumor, antimicrobial, and phytotoxic activities of the marine antibiotic pentabromopseudilin (1a) and related phenyl-, benzyl- and benzoyl pyrroles were compared. All activities depended strongly on the substituent pattern, with the natural compound 1a being the most active one. As judged from model reactions, a covalent bond of nucleophiles to the pyrrole system may be involved in the inhibition of macromolecular syntheses.