hamigerans D, G, L, and N–Q has been accomplished. A convergent approach was used to build the basic tricarbocyclic ring system bearing a 5‐6‐6 structure. A sequence of oxidative cleavage, homologation, and ring regeneration provided access to the 5‐7‐6 skeleton of hamigeran G. Based on the biogenetic hypothesis, elegant and highly efficient biomimetic transformations of hamigeran G into hamigerans D, N–Q
Hamigerans R and S: Nitrogenous Diterpenoids from the New Zealand Marine Sponge <i>Hamigera</i> tarangaensis
作者:Ethan F. Woolly、A. Jonathan Singh、Euan R. Russell、John H. Miller、Peter T. Northcote
DOI:10.1021/acs.jnatprod.7b00960
日期:2018.2.23
isolated from the New Zealand marine sponge Hamigera tarangaensis. Among the new additions are hamigeran R (1), considered to be the first benzonitrile-based marine natural product, and hamigeran S (2), the first dimeric structure in the series. The formation of 1 and 2 is thought to occur via the reaction of hamigeran G with a nitrogen source, where the nitrile carbon of 1 is derived from the terpenoid
Concise Total Syntheses of the 6–7–5 Hamigeran Natural Products
作者:Baiyang Jiang、Mingji Dai
DOI:10.1021/jacs.3c06031
日期:2023.8.30
syntheses of four hamigeran natural products featuring a 6–7–5 tricyclic carbon skeleton. We utilized a palladium-catalyzed intramolecular cyclopropanol ring opening cross-coupling to build the central seven-membered ring and a series of oxidations including a challenging aromatic C–H oxidation to introduce the peripheral functionalities. This approach enabled us to achieve the first total syntheses