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3 article(s) from Bruns, Hilke

N-Acylated amino acid methyl esters from marine Roseobacter group bacteria

Hilke Bruns,
Lisa Ziesche,
Nargis Khakin Taniwal,
Laura Wolter,
Thorsten Brinkhoff,
Jennifer Herrmann,
Rolf Müller and
Stefan Schulz

Beilstein J. Org. Chem. 2018, 14, 2964–2973, doi:10.3762/bjoc.14.276

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Figure 1: N-Acylhomoserine lactones 1 (Z7-C14:1-AHL) and N-acylalanine methyl esters 2 (Z9-C16:1-NAME) occurr...

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Figure 2: Total ion chromatogram (TIC) of an XAD extract of Roseovarius sp. D12_1.68. AHLs, NAMEs and related...

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Scheme 1: Synthesis of iso-C15:0-NAME (6). DMAP: 4-dimethylaminopyridine, EDC: 1-ethyl-3-(3-dimethylaminoprop...

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Figure 3: Mass spectrum of natural compound D, N-(13-methyltetradecanoyl)alanine methyl ester (iso-C15:0-NAME...

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Figure 4: Mass spectra of natural compounds a) K (7, C16:0-NABME), b) J (8, C16:1-NABME), and c) N (9, C16:1-...

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Scheme 2: Synthesis of N-acylated amino acid methyl esters 7–11. AAME: amino acid methyl ester.

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Figure 5: TIC of an XAD extract of Loktanella sp. F14. Compound S is a minor component within the broad peak.

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Figure 6: Mass spectra of natural compounds a) R (11, C16:1-NAGME) and b) S (10, C16:0-NAGME).

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Figure 7: EI mass spectrometric fragmentation of N-acylated amino acid derivatives. The ions w–z allow identi...

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Figure 8: MS² spectra in ESI positive mode of a) Z9-16OH-C16:1-NAME with [M + H − H₂O]⁺ 356, b) Z9-C16:1-NABM...

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Published 03 Dec 2018

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Algicidal lactones from the marine Roseobacter clade bacterium Ruegeria pomeroyi

Ramona Riclea,
Julia Gleitzmann,
Hilke Bruns,
Corina Junker,
Barbara Schulz and
Jeroen S. Dickschat

Beilstein J. Org. Chem. 2012, 8, 941–950, doi:10.3762/bjoc.8.106

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Figure 1: Important metabolites in the interaction of bacteria from the Roseobacter clade with marine algae.

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Figure 2: (A) Total ion chromatogram of a headspace extract from R. pomeroyi, (B) structures of lactones rele...

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Figure 3: Mass spectra of the compounds 7–11 emitted by R. pomeroyi.

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Scheme 1: Synthesis of compounds 7–11. For these target structures the relative configurations are shown.

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Scheme 2: Enantioselective synthesis of (2R,4S)-7 and (2S,4S)-8.

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Figure 4: Enantioselective GC analyses for the assignment of the enantiomeric compositions of natural (2S,4R)-...

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Published 25 Jun 2012

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Novel fatty acid methyl esters from the actinomycete Micromonospora aurantiaca

Jeroen S. Dickschat,
Hilke Bruns and
Ramona Riclea

Beilstein J. Org. Chem. 2011, 7, 1697–1712, doi:10.3762/bjoc.7.200

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Scheme 1: Fatty acid biosynthesis.

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Figure 1: Volatile methyl esters from bacteria.

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Figure 2: Compounds found in the headspace extracts of M. aurantiaca.

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Figure 3: Total ion chromatograms of the headspace extract from M. aurantiaca (A), and expansions of the tota...

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Figure 4: FAMEs identified in the headspace extracts from M. aurantiaca.

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Figure 5: Mass spectra of (A) methyl dodecanoate (83), (B) methyl 2-methyldodecanoate (10), (C) methyl 4-meth...

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Scheme 2: McLafferty fragmentation of FAMEs.

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Figure 6: The functional group increment FG(n)_{FAME, HP-5 MS}.

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Scheme 3: Synthesis of FAMEs identified from M. aurantiaca.

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Scheme 4: Synthesis of the γ- and (ω−3)-methyl branched FAME 114.

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Figure 7: Mass spectra of tentatively identified methyl 4,8-dimethyldodecanoate (115) and methyl 8-ethyl-4-me...

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Published 20 Dec 2011

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