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3 article(s) from Köck, Matthias

Bromotyrosine-derived alkaloids from the Caribbean sponge Aplysina lacunosa

Qun Göthel,
Thanchanok Sirirak and
Matthias Köck

Beilstein J. Org. Chem. 2015, 11, 2334–2342, doi:10.3762/bjoc.11.254

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Figure 1: Three new bromotyrosine derivatives isolated from sponge Aplysina lacunosa: 14-debromo-11-deoxyfist...

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Figure 2: Bromotyrosine alkaloids and brominated compounds isolated from the sponge Aplysina lacunosa.

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Figure 3: 1,1-ADEQUATE spectrum of 14-debromo-11-deoxyfistularin-3 (1).

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Figure 4: The tissue damage induced chemical conversion from fistularin-3 (5) to 19 by an undefined enzyme in...

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Figure 5: Diacetylhexadellin B (20) isolated from sponge Hexadella sp.

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Figure 6: Bromotyrosine alkaloid (21) isolated from the sponge Verongula sp.

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Published 26 Nov 2015

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The marine sponge Agelas citrina as a source of the new pyrrole–imidazole alkaloids citrinamines A–D and N-methylagelongine

Christine Cychon,
Ellen Lichte and
Matthias Köck

Beilstein J. Org. Chem. 2015, 11, 2029–2037, doi:10.3762/bjoc.11.220

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Figure 1: Selected pyrrole-imidazole alkaloids (1–4, 6–11, and 13–20), and agelongine analogues (5, 12, and 21...

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Figure 2: Selected ¹H,¹H-COSY (blue bonds), ¹H,¹H-NOESY (blue arrows), ¹H,¹³C-HMBC, and ¹H,¹⁵N-HMBC (both red...

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Figure 3: Selected ¹H,¹H-COSY (blue bonds), ¹H,¹H-NOESY (blue arrows), ¹H,¹³C-HMBC, and ¹H,¹⁵N-HMBC (both red...

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Figure 4: Selected ¹H,¹H-COSY (blue bonds), ¹H,¹H-NOESY (blue arrows), and ¹H,¹³C-HMBC (red arrows) correlati...

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Figure 5: Selected ¹H,¹H-COSY (blue bonds), ¹H,¹H-NOESY (blue arrows), ¹H,¹³C-HMBC, and ¹H,¹⁵N-HMBC (both red...

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Figure 6: Selected ¹H,¹H-COSY (blue bonds), ¹H,¹³C-HMBC, and ¹H,¹⁵N-HMBC (both red arrows) correlations for N...

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Published 29 Oct 2015

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New sesquiterpene hydroquinones from the Caribbean sponge Aka coralliphagum

Qun Göthel and
Matthias Köck

Beilstein J. Org. Chem. 2014, 10, 613–621, doi:10.3762/bjoc.10.52

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Figure 1: Structures of the new compounds siphonodictyals E1–E4 (1–4) and cyclosiphonodictyol A (5) isolated ...

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Figure 2: Structures of the related known compounds siphonodictyal B1 (6), siphonodictyal B2 (7), siphonodict...

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Figure 3: Selected ¹H,¹³C-HMBC correlations (H → C) and ¹H,¹H-COSY correlation (bold line) observed for sipho...

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Figure 4: Selected ¹H,¹³C-HMBC correlations (H → C) observed for siphonodictyal E2 (2).

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Figure 5: Possible constitutions for the aromatic moieties of siphonodictyals E2 (2) and E3 (3) (sum over all...

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Figure 6: Selected ¹H,¹³C-HMBC correlations (H → C) observed for siphonodictyal E4 (4a).

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Figure 7: Proposed biogenesis of 4a starting from the hypothetical precursor 3-ox with an acyclic sesquiterpe...

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Figure 8: Hypothetical biogenesis of the bicyclic sesquiterpenoid moiety from the acyclic precursor of the si...

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Published 06 Mar 2014

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