3 article(s) from Kaiser, Marcel
- Full Research Paper
- Published 27 Feb 2019
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Figure 1: Structures of the natural (+)-artemisinin (1) and the synthesized (+)-3-hydroxymethylartemisinin (2...
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Scheme 1: Synthesis of the Diels–Alder precursor 8 over four steps in 71% yield, starting from aldehyde 3 and...
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Scheme 2: Synthesis of (+)-3-hydroxymethyl-9-desmethylartemisinin (16), starting from Diels–Alder derivatives ...
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Scheme 3: Synthesis of (+)-3-hydroxymethyl-9-epi-artemisinin (18) and (+)-3-hydroxymethylartemisinin (2). Rea...
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- Full Research Paper
- Published 03 Dec 2014
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Figure 1: Structure and absolute configuration of hormaomycin (1), its fluoromethyl-substituted analogues 8a–c...
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Figure 2: Structures of the Belokon'-type glycine complexes (BGC) (R)- and (S)-10.
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Scheme 1: Intended routes to methyl trans-2-(fluormethyl)cyclopropanecarboxylates 14a–c.
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Scheme 2: Synthesis of trans-(2-trifluoromethyl)cyclopropanecarboxylic acid (24).
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Scheme 3: Preparation of racemic trans-2-(fluoromethyl)cyclopropylmethyl iodides 11a–c and their conversion t...
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Figure 3: Structure and absolute configurations of the nickel(II) complexes (2S,1'R,2'S)-26a, (2S,1'R,2'S)-26b...
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Figure 4: Structure and absolute configuration of nickel(II) complex (R,R,R)-28 in the crystal. Hydrogen atom...
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Scheme 4: Mechanism of epimerization of the threonine nickel(II) complex 29.
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Scheme 5: A new general approach to (2S,3R)-β-methylarylalanines 3 by alkylation of the glycine nickel(II) co...
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Figure 5: Structure and absolute configuration of nickel(II) complex (2S,3S)-32 in the crystal. Hydrogen atom...
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Scheme 6: Synthesis of the cyclohexadepsipeptides 52a–c for the hormaomycin analogues 8a–c with 3-(2'-fluorom...
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Scheme 7: Synthesis of hormaomycin analogues with a: trifluoromethyl-, b: difluoromethyl-, c: monofluoromethy...
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Figure 6: Two derivatives 58 and 59 of cyclohexadepsipeptide 52a containing the (trifluoromethylcyclopropyl)a...
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- Letter
- Published 11 Apr 2012
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Figure 1: Structure of depsipeptides szentiamide (1) [12] and xenematide (2) [8] identified in Xenorhabdus strains.
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Scheme 1: Overview of the synthetic strategy.
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Scheme 2: Synthesis of compound 1.
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Figure 2: HPLC–MS data of an XAD-extract of X. szentirmaii (a; base-peak chromatogram), the natural 1 (b; ext...
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