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A strategy for the structural modification of biologically important alkene-containing natural products via ring-opening olefin metathesis is described. Exposure of manzamine A 1 to the second-generation Grubbs catalyst in the presence of ethylene leads to the formation of 2 and 4. The antibacterial activity of the novel manzamine analogue 2 (IC50=0.10 nM) against Mycobacterium intracellulare is ca. 2-fold more potent than that of ciprofloxacin (IC50=0.18 nM), a drug that is frequently used against antibiotic-resistant infections.

Synthetic Modification of Manzamine A via Grubbs Metathesis. Novel Structures with Enhanced Antibacterial and Antiprotozoal Properties