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4 article(s) from Kawasaki-Takasuka, Tomoko

Facile preparation and conversion of 4,4,4-trifluorobut-2-yn-1-ones to aromatic and heteroaromatic compounds

Takashi Yamazaki,
Yoh Nakajima,
Minato Iida and
Tomoko Kawasaki-Takasuka

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Published 15 Jan 2021

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1. Graphical Abstract
2. Scheme 1: Deacetylative cyclization of 3fa.
  
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Beilstein J. Org. Chem. 2021, 17, 132–138, doi:10.3762/bjoc.17.14

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Diastereoselective Mannich reactions of pseudo-C₂-symmetric glutarimide with activated imines

Tatsuya Ishikawa,
Tomoko Kawasaki-Takasuka,
Toshio Kubota and
Takashi Yamazaki

Full Research Paper
Published 21 Nov 2017

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1. Graphical Abstract
2. Figure 1: Crystallographic analysis of the major diastereomer of 3a (some hydrogen atoms are omitted for clar...
  
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3. Scheme 1: Explanation of the construction of the main stereoisomers.
  
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Beilstein J. Org. Chem. 2017, 13, 2473–2477, doi:10.3762/bjoc.13.244

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Base-promoted isomerization of CF₃-containing allylic alcohols to the corresponding saturated ketones under metal-free conditions

Yoko Hamada,
Tomoko Kawasaki-Takasuka and
Takashi Yamazaki

Full Research Paper
Published 01 Aug 2017

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2. Scheme 1: Et₃N-promoted isomerization of propargylic alcohols 1F.
  
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3. Figure 1: Calculated transition state model TS-8h for the present proton shift starting from (R,E)-6h (some h...
  
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Beilstein J. Org. Chem. 2017, 13, 1507–1512, doi:10.3762/bjoc.13.149

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Regioselective carbon–carbon bond formation of 5,5,5-trifluoro-1-phenylpent-3-en-1-yne

Motoki Naka,
Tomoko Kawasaki-Takasuka and
Takashi Yamazaki

Full Research Paper
Published 23 Oct 2013

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1. Graphical Abstract
2. Scheme 1: Proposed reaction mechanism between 1 and MeLi.
  
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3. Scheme 2: Furan synthesis from a mixture of 5a and 6a.
  
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4. Scheme 3: Deuteration of anionic species from 4.
  
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5. Figure 1: A part of ¹H NMR chart of 4 and its deuterated mixture.
  
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6. Scheme 4: Lithiation of 4 and the following electrophilic reactions.
  
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7. Scheme 5: Alternative reaction mechanism between 1 and MeLi.
  
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Beilstein J. Org. Chem. 2013, 9, 2182–2188, doi:10.3762/bjoc.9.256

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