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2 article(s) from Lopp, Margus

Designed whole-cell-catalysis-assisted synthesis of 9,11-secosterols

Marek Kõllo,
Marje Kasari,
Villu Kasari,
Tõnis Pehk,
Ivar Järving,
Margus Lopp,
Arvi Jõers and
Tõnis Kanger

Full Research Paper
Published 01 Mar 2021

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1. Graphical Abstract
2. Figure 1: A) Tetracyclic core of steroids and possible sites of bond cleavages for secosteroids. B)The first ...
  
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3. Scheme 1: Retrosynthetic analysis of 9,11-secosterols.
  
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4. Scheme 2: Synthesis of starting materials. Reagents and conditions: i) NaBH₄, EtOH/CH₂Cl₂ 1:1, 2 h, rt, then ...
  
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5. Scheme 3: Oxidation of diols 5 and 6 with NaOCl·5H₂O.
  
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Supp. Info

Beilstein J. Org. Chem. 2021, 17, 581–588, doi:10.3762/bjoc.17.52

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Organocatalytic asymmetric addition of malonates to unsaturated 1,4-diketones

Sergei Žari,
Tiiu Kailas,
Marina Kudrjashova,
Mario Öeren,
Ivar Järving,
Toomas Tamm,
Margus Lopp and
Tõnis Kanger

Full Research Paper
Published 04 Sep 2012

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1. Graphical Abstract
2. Figure 1: The conjugated addition to unsaturated 1,4-diketone 1.
  
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3. Figure 2: Organocatalysts screened.
  
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4. Figure 3: Proposed transition state.
  
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5. Figure 4: Calculated (red) and experimental (blue) IR (A) and VCD spectrum (B) of compound (R)-3a.
  
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Beilstein J. Org. Chem. 2012, 8, 1452–1457, doi:10.3762/bjoc.8.165

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