Hybrid aminoglycoside antibiotics via Tsuji palladium-catalyzed allylic deoxygenation

Biosynthetically inspired manipulation of the antibiotic paromomycin led, in six high-yielding steps, to a ring A harboring an α,β-unsaturated 6'-aldehyde and an allylic 3'-methylcarbonate group. Tsuji deoxygenation in the presence of 5 mol % Pd(2)(dba)(3) and Bu(3)P granted access to a novel series of 3',4'-dideoxy-4',5'-dehydro ring A hybrids. The neomycin-sisomicin hybrid exhibited superior in vitro antibacterial activity to the parent compound neomycin.