5 article(s) from Schnakenburg, Gregor
- Letter
- Published 07 Sep 2022
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Scheme 1: Structures of hangtaimycin (1) and its co-metabolites.
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Scheme 2: First synthetic route towards TDD (4).
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Figure 1: HPLC analyses of (Z)-4 on a chiral stationary phase. A) Nearly racemic 4 from the first synthetic r...
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Scheme 3: Second synthetic route towards TDD ((Z)-4).
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Figure 2: X-ray structure of (rac)-4.
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Figure 3: Bioactivity testing with hangtaimycin (1). A) Growth retardation of model species B. subtilis 168 a...
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- Full Research Paper
- Published 03 Jan 2022
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Figure 1: Initially assigned structures for patchoulol by Treibs (1) and by Büchi (2). Structures of patchoul...
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Scheme 1: Biosynthesis of patchoulol (part I). A) Cyclisation mechanism from FPP to 3 as suggested by Croteau...
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Scheme 2: Biosynthesis of patchoulol (part II). A) Cyclisation mechanism from FPP to 3 as suggested by Akhila...
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Scheme 3: Biosynthesis of patchoulol (part III). A) Cyclisation mechanism from FPP to 3 as suggested by Faral...
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Figure 2: ORTEP representation of patchoulol (3). Cu Kα, Flack parameter: −0.1(2); P2(true) = 1.000, P3(false...
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Scheme 4: Determination of the absolute configurations of compounds 3 and 12 through stereoselective labellin...
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Scheme 5: Labelling experiments on the biosynthesis of patchoulol (3, part 1). Black dots indicate 13C-labell...
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Scheme 6: Labelling experiments on the biosynthesis of patchoulol (3, part 2). Black dots indicate 13C-labell...
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Figure 3: Energy profile from DFT calculations (Gibbs energies at 298 K, mPW1PW91/6-311 + G(d,p)//B97D3/6-31G...
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Figure 4: Structure elucidation of (2S,3S,7S,10R)-guaia-1,11-dien-10-ol (17) and structure of its known stere...
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- Full Research Paper
- Published 20 Apr 2020
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Figure 1: Structures of trifluoromethylated compounds and their biological activities.
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Figure 2: Synthetic approaches toward hydroxyalkylation of indole.
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Figure 3: Structures of heterocycles that did not react with ketone 2a.
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Scheme 1: Gram-scale synthesis of 2,2,2-trifluoro-1-(1H-indol-3-yl)-1-phenylethan-1-ols (3a and 3p).
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Figure 4: Recyclability of the catalytic system n-Bu4PBr/K2CO3 for the preparation of 2,2,2-trifluoro-1-(5-me...
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Scheme 2: Synthesis of trifluoromethylated unsymmetrical 3,3'- and 3,6'-DIMs (9–11).
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Scheme 3: Proposed mechanism for the preparation of 3a as an example.
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Scheme 4: Control experiments.
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- Full Research Paper
- Published 09 Apr 2014
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Scheme 1: Off- (open) and on- (closed) states of a ditopic positive allosteric receptor based on a 4,4’-funct...
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Scheme 2: Bis(β-cyclodextrin)-functionalised 2,2’-bipyridines 1–3.
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Scheme 3: Synthesis of diisothiocyanato-2,2’-bipyridines 14–16.
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Scheme 4: Synthesis of peracetylated cyclodextrin 21.
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Scheme 5: Synthesis of receptors 1–3.
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Figure 1: X-ray crystal structure analysis of [(CO)3Re(14)Cl] (colour code: petrol: rhenium, grey: carbon, re...
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Figure 2: MALDI mass spectrum (sample prepared from a 1:1 mixture of CuPF6 and 2 in benzene/acetonitrile (1:1...
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Figure 3: Aromatic region of the 1H NMR spectra (400.1 MHz, 293 K, benzene-d6/acetonitrile-d3 1:1) of a) 1 an...
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Figure 4: Aromatic region of the 1H NMR spectra (400.1 MHz, 293 K, benzene-d6/acetonitrile-d3 1:1) of a) 2 an...
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Scheme 6: Synthesis of ligand 22.
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Figure 5: X-ray crystal structure analysis of [Cu(H3CCN)2(22)]BF4 and [Zn(22)2](OTf)2 (counterions are omitte...
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Figure 6: Aromatic region of the 1H NMR spectra (400.1 MHz, 293 K, benzene-d6/acetonitrile-d3 1:1) of a) 1, b...
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Figure 7: MALDI–TOF mass spectrum (sample prepared from of a 1:1:1 mixture of CuPF6, 22, and 1 in benzene/ace...
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- Published 13 Dec 2010
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Scheme 1: Synthesis of 4. a) 1) EtLi, Et2O, −78 °C, 1 h; 2) (COOMe)2, Et2O, −78 °C, 2 h, 33%; b) FeCl3, MeNO2...
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Scheme 2: Synthesis of 8. a) Pd(PPh3)4, Na2CO3, toluene, EtOH, H2O, reflux, 87%; b) oxalyl chloride, 1,2-dich...
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Scheme 3: Preparation of phenazine isomers. a) AcOH, 50 °C, 2 h, 93% (10a), 53% (10b). b) AcOH, 50 °C, 2 h, 6...
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Scheme 4: Suzuki–Miyaura reactions with 10a/10b. a) Pd(PPh3)4, Na2CO3, toluene, EtOH, H2O, reflux, 23% (12a),...
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Scheme 5: Suzuki–Miyaura reactions with 11a/11b. a) Pd(PPh3)4, Na2CO3, toluene, EtOH, H2O, reflux, 50% (16), ...
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Figure 1: a) Absorption (solid lines) and emission (dotted lines) spectra of compounds 12a (blue), 13 (red), ...
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Figure 2: Calculated absorption spectra of (a) 19, (b) 20, (c) 12a, (d) 13 with R=CH3, (e) 16 and (f) 17a. In...
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Figure 3: Self-assembled monolayer of 12b on HOPG. a) STM image (VS = −0.8 V, It = 80 pA, image size 25.0 × 2...
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