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2 article(s) from Becher, Jonas

Synthesis and investigation of quadruplex-DNA-binding, 9-O-substituted berberine derivatives

Jonas Becher,
Daria V. Berdnikova,
Heiko Ihmels and
Christopher Stremmel

Beilstein J. Org. Chem. 2020, 16, 2795–2806, doi:10.3762/bjoc.16.230

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Scheme 1: The structures and numbering of berberine (1a) and the alkyl-substituted derivatives 1aⁿ–eⁿ and the...

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Scheme 2: Synthesis of the berberine–adenine conjugates 4a–e.

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Figure 1: Representative spectrophotometric (A) and spectrofluorimetric (B) titration of compound 4c with 22AG...

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Figure 2: Melting temperatures, ΔT_m, of G4-DNA (c_DNA = 0.2 µM) F21T (black), F21T plus ds26 (15 equiv, red), ...

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Figure 3: CD spectra of 22AG (A) and a2 (B) in the presence of the ligands 4c (in K⁺-phosphate buffer (pH 7.0...

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Figure 4: The simplified structure of the complex between 1e³ and quadruplex DNA (left; [38]) and the proposed or...

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Published 18 Nov 2020

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Interactions between photoacidic 3-hydroxynaphtho[1,2-b]quinolizinium and cucurbit[7]uril: Influence on acidity in the ground and excited state

Jonas Becher,
Daria V. Berdnikova,
Darinka Dzubiel,
Heiko Ihmels and
Phil M. Pithan

Beilstein J. Org. Chem. 2017, 13, 203–212, doi:10.3762/bjoc.13.23

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Figure 1: Structures of quinolizinium derivatives 1a–c and 2.

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Scheme 1: Synthesis of 3-hydroxynaphtho[1,2-b]quinolizinium bromide (2).

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Figure 2: Absorption (A, c = 100 µM) and normalized emission spectra (B, c = 10 µM or Abs. = 0.1 at λ_ex) of d...

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Figure 3: Photometric (A) and fluorimetric (B) acid–base titration (λ_ex = 380 nm) of naphthoquinolizinium 2 (c...

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Figure 4: Absorption spectra of 2 (c = 100 µM) in MeOH (A) and MeCN (B). Black lines: without additive, red: ...

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Figure 5: Normalized emission spectra of 2 (c = 10 µM) in MeOH (A, λ_ex = 400 nm) and MeCN (B, λ_ex = 398 nm). ...

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Figure 6: Photometric titration of CB[7] (c = 0.45 mM) to 2 (c = 15 µM) in BPE buffer (with 10% v/v DMSO) at ...

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Figure 7: Photometric (A) and fluorimetric (B) acid–base titration (λ_ex = 380 nm) of 2 (c = 15 µM) in the pre...

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Scheme 2: Acid–base equilibrium of hydroxynaphthoquinolizinium 2.

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Figure 8: Structures of quinolizinium derivatives 6–8.

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Published 01 Feb 2017

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