Výsledky vyhledávání - "Toshiaki Sasada"

An Oxidant-Free Single-Step Synthesis of Tetra- or Disubstituted Symmetrical Pyridine Derivatives by a Hf(OTf)4-Catalyzed Annulation

Autor: Toshiaki Sasada, Fuminori Kobayashi, Norio Sakai, Takeo Konakahara, Masato Moriuchi

Publikováno v: Synlett. 2011:2029-2034

The Hf(OTf)4-catalyzed unprecedented annulation of an enamine with triethyl orthoformate leading to the preparation of tetrasubstituted symmetrical pyridine derivatives without an oxidant is described. This method accommodated the single-step synthes

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::38b338f7d5306b969118b16301bf1871
https://doi.org/10.1055/s-0030-1260978

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Approach to Trisubstituted 3-Aminopyrrole Derivatives by Yb(OTf)3-Catalyzed [4+1] Annulation of 2-Azadiene with Me3SiCN

Autor: Reiko Ikeda, Toshiaki Sasada, Norio Sakai, Takuya Sawada, Takeo Konakahara

Publikováno v: European Journal of Organic Chemistry. 2010:4237-4244

In the present study, we found a novel approach to the simple and practical synthesis of 3-aminopyrrole derivatives through the four-component coupling reaction of a functionalized silane, a nitrile, an aldehyde, and trimethylsilyl cyanide by Yb(OTf)

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8bc949d11d2e81e20d95bc80bffd2240
https://doi.org/10.1002/ejoc.201000241

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An Unprecedented Approach to the Single-Step Synthesis of 3,4-Fused Pyrimidin-2-one and Pyrimidin-2-thione Derivatives by a [3+2+1] Annulation

Autor: Takeo Konakahara, Norio Sakai, Toshiaki Sasada, Masato Moriuchi

Publikováno v: European Journal of Organic Chemistry. 2009:5738-5743

An unprecedented three-component coupling reaction was developed for the synthesis of 3,4-fused pyrimidin-2-one and pyrimidin-2-thione derivatives from an α-acidic imine compound, a nitrile, and triphosgene or carbon disulfide. This method can be us

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e2424f9295203914147f788aa422aaa8
https://doi.org/10.1002/ejoc.200900639

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ChemInform Abstract: Synthesis of Tri- or Tetrasubstituted Pyrimidine Derivatives Through the [5 + 1] Annulation of Enamidines with either N,N-Dimethylformamide Dialkyl Acetals or Orthoesters and Their Application in a Ring Transformation of Pyrimidines t

Autor: Toshiaki Sasada, Takeo Konakahara, Norio Sakai, Youichi Aoki, Reiko Ikeda

Publikováno v: ChemInform. 43

The [5+1] annulation of enamidines, which were prepared from functionalized silanes, organolithium compounds and two nitriles, with N,N-dimethylformamide dialkyl acetals as the C1 unit is described, leading to the synthesis of tri- and tetrasubstitut

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::678621542f5c32be84763287d9d52c72
https://doi.org/10.1002/chin.201202166

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Synthesis of tri- or tetrasubstituted pyrimidine derivatives through the [5+1] annulation of enamidines with either N,N-dimethylformamide dialkyl acetals or orthoesters and their application in a ring transformation of pyrimidines to pyrido[2,3-d]pyrimidin-5-one derivatives

Autor: Norio Sakai, Toshiaki Sasada, Reiko Ikeda, Youichi Aoki, Takeo Konakahara

Publikováno v: Chemistry (Weinheim an der Bergstrasse, Germany). 17(34)

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d7943e135de1853c0ef928f65d0e0aed
https://pubmed.ncbi.nlm.nih.gov/21780196

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ChemInform Abstract: Approach to Trisubstituted 3-Aminopyrrole Derivatives by Yb(OTf)3-Catalyzed [4 + 1] Annulation of 2-Azadiene with Me3SiCN

Autor: Takeo Konakahara, Toshiaki Sasada, Reiko Ikeda, Takuya Sawada, Norio Sakai

Publikováno v: ChemInform. 41

In addition to the novel synthesis of 3-aminopyrroles, the transformation of pyrroles bearing the isoxazole group into pyrrolo[3,4-b]pyridin-4-ones through a reductive ring-opening reaction and subsequent intramolecular cyclization is reported.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6e8d54e18b1c09b36c6c078302270866
https://doi.org/10.1002/chin.201052108

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ChemInform Abstract: An Unprecedented Approach to the Single-Step Synthesis of 3,4-Fused Pyrimidin-2-one and Pyrimidin-2-thione Derivatives by a [3 + 2 + 1] Annulation

Autor: Takeo Konakahara, Masato Moriuchi, Toshiaki Sasada, Norio Sakai

Publikováno v: ChemInform. 41

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::15cc9641dd4c9dac5c4585fe83a0ea81
https://doi.org/10.1002/chin.201011167

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ChemInform Abstract: Me3SiCl-Promoted Three-Component Coupling Reaction of a Functionalized Enamine, an Acetal, and an Alkyne: An Unprecedented Approach to the Synthesis of Tetrasubstituted Pyridines via a [3 + 2 + 1] Intermolecular Cyclization

Autor: Norio Sakai, Takeo Konakahara, Toshiaki Sasada

Publikováno v: ChemInform. 40

We have identified a Me3SiCl-mediated three-component coupling reaction of a functionalized enamine, N,N-dimethylformamide diethyl acetal, and an internal alkyne having an electron-withdrawing group that produces 2,3,4,5-tetrasubstituted pyridine der

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::97a20d827aa89a973ad90d5a1c7db468
https://doi.org/10.1002/chin.200903149

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Me3SiCl-promoted three-component coupling reaction of a functionalized enamine, an acetal, and an alkyne: an unprecedented approach to the synthesis of tetrasubstituted pyridines via a [3 + 2 + 1] intermolecular cyclization

Autor: Toshiaki Sasada, Takeo Konakahara, Norio Sakai

Publikováno v: The Journal of organic chemistry. 73(17)

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3cc3faf5f48cf1bc0d836a512b899ae2
https://pubmed.ncbi.nlm.nih.gov/18661946

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