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Your search keyword '"Asoh, A"' showing total 22 results
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22 results on '"Asoh, A"'

1. ChemInform Abstract: Total Synthesis of (.+-.)-6α-Hydroxyachilla-9,13,17,21-tetraene and (.+-.)-8α-Hydroxypolypoda-13,17,21-triene

Author

Mugio Nishizawa, Hidetoshi Yamada, Kohsuke Asoh, Susumi Hatakeyama, Hiroko Takao, and Naoko Kanoh

Subjects
chemistry.chemical_classification, Olefin fiber, biology, Stereochemistry, Cationic polymerization, Total synthesis, General Medicine, biology.organism_classification, Terpene, Polypodiaceae, Triterpene, chemistry, Intramolecular force, Fern
Abstract

Novel triterpene alcohols with achillane and polypodane skeletons isolated from Polypodiaceae fern have been synthesized on the basis of inter and intramolecular trapping of cationic intermediates of the biomimetic olefin cyclization.

Published
2010
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3. ChemInform Abstract: Palladium-Catalyzed Reductive Cyclization Reaction in Alkaloid Synthesis - An Enantioselective Total Synthetic Route to (+)- Pumiliotoxin C

Author

Takanobu Asoh, Masahiro Toyota, and Keiichiro Fukumoto

Subjects
Pumiliotoxin C, chemistry, Homogeneous, Alkaloid synthesis, Enantioselective synthesis, chemistry.chemical_element, Organic chemistry, General Medicine, Combinatorial chemistry, Palladium, Catalysis
Abstract

Beginning with the chirally homogeneous cyclohexenol 3, an enantioselective total synthetic route to (+)-pumiliotoxin C (1) has been described. Palladium catalyzed reductive cyclization reaction was employed to prepare a key component in the synthesis.

Published
2010
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6. ChemInform Abstract: Unexpected Rearrangement During Biomimetic Entry Toward a Taxane Skeleton

Author

Hiroshi Imagawa, Ikumi Hyodo, Kohsuke Asoh, Hidetoshi Yamada, Miho Takeji, Mugio Nishizawa, and Eiko Morikuni

Subjects
chemistry.chemical_compound, Mercuric triflate, chemistry, Bicyclic molecule, Stereochemistry, General Medicine, Derivative (chemistry)
Abstract

Bicyclo[9.3.1]pentadecatriene derivative 4 which corresponds to a precursor of taxol in a biomimetic entry was constructed by means of TiCl 4 Zn promoted McMurry cyclization and Mitsunobu inversion. Treatment of 4 with mercuric triflate afforded an unexpected rearrangement-transannular cyclization product 5 .

Published
2010
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8. Stereoselective Construction of Four Consecutive Stereocenters Using [2,3]-Wittig Rearrangement Reaction

Author

Masataka Ihara, Masako Hirota, Takanobu Asoh, and Masahiro Toyota

Subjects
Pharmacology, chemistry.chemical_compound, Stereochemistry, Chemistry, Organic Chemistry, Organic chemistry, Stereoselectivity, Oxazoline, General Medicine, 2,3-Wittig rearrangement, Analytical Chemistry, Stereocenter
Abstract

A diastereoselective construction of four consecutive stereocenters has been achieved using [2,3]-Wittig rearrangement reactions of oxazoline derivatives.

Published
2004
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18. ChemInform Abstract: Synthesis and Molecular Structure of Tetrathia(34)(1,2,4,5)cyclophane

Author

Masami Sawada, Toshiaki Asoh, Kazuhide Tani, Takahiro Kaneda, Soichi Misumi, Takanori Tanaka, and Hiroyuki Higuchi

Subjects
chemistry.chemical_compound, Chemistry, Computational chemistry, Molecule, General Medicine, Cyclophane
Abstract

The titled tetrathiacyclophane was prepared by improved synthetic methods and its molecular structure previously reported was corrected by 1H-NMR and X-ray analyses.

Published
1988
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