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Neoabyssomicin A (1) possessing a caged 6/6/6 ring system fused with two additional 6/9 lactone rings, neoabyssomicin B (2) featuring a 12-membered macrolactone ring and its seco-form, neoabyssomicin C (3), along with the known abyssomicin 2 (4) and 4 (5), were discovered from the deep-sea derived Streptomyces koyangensis SCSIO 5802. The structures of 1–3 were elucidated on the basis of MS, NMR spectroscopic...
Nickel-catalyzed intramolecular cyclization of cyclohexa-1,3-dienes and an aldehyde in a chain produced fused, bridged or spiro bicyclic skeletons depending on the length of the tether. This chemistry can be extended to cyclohepta-1,3-dienes and cyclohepta-1,3,5-trienes having an aldehyde moiety on the side chain.
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