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Start Over "Momochika Kumagai" Journal angewandte chemie international edition
3 results on '"Momochika Kumagai"'

1. Cover Picture: Critical Switching of Cyclization Modes of Polyepoxides in Acidic Aqueous Media and Neutral Water: Synthesis and Revised Structure of a Nerolidol‐Type Sesquiterpenoid (Angew. Chem. Int. Ed. 30/2019)

Author

Takumi Ikeuchi, Subaru Hashimoto, Akihiro Hoshino, Momochika Kumagai, Keisuke Nishikawa, Yoshiki Morimoto, and Kengo Morita

Subjects
chemistry.chemical_compound, Aqueous medium, chemistry, Biomimetic synthesis, INT, Organic chemistry, Cover (algebra), General Chemistry, Catalysis, Nerolidol
Published
2019
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2. Critical Switching of Cyclization Modes of Polyepoxides in Acidic Aqueous Media and Neutral Water: Synthesis and Revised Structure of a Nerolidol‐Type Sesquiterpenoid.

Author

Nishikawa, Keisuke, Morita, Kengo, Hashimoto, Subaru, Hoshino, Akihiro, Ikeuchi, Takumi, Kumagai, Momochika, and Morimoto, Yoshiki

Subjects
WATER, BIOMIMETIC synthesis, PRESS, PLASMA beam injection heating
Abstract

Biomimetic epoxide‐opening cascades of polyepoxides enable the efficient and rapid construction of polyether frameworks. Herein, we show that the epoxide‐opening cascade cyclization that affords tetrahydrofuran products in acidic aqueous media produces tetrahydropyran (THP) in neutral water. THP formation proceeded by simply heating polyepoxides in neutral water and followed a different cyclization mode from those observed so far. The novel cascade cyclization in H2O was applied to the synthesis of a new nerolidol‐type sesquiterpenoid, resulting in revision of the proposed structure and determination of the absolute configuration. [ABSTRACT FROM AUTHOR]

Published
2019
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