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Your search keyword '"Takeshi Ohnuma"' showing total 2 results
Start Over Author "Takeshi Ohnuma" Publisher royal society of chemistry (rsc)
2 results on '"Takeshi Ohnuma"'

1. Total synthesis of the alkaloid (±)-deoxyaspidodispermine

Author

Yoshio Ban, Takeshi Oishi, Koh-ichi Seki, and Takeshi Ohnuma

Subjects
biology, Stereochemistry, Chemistry, Alkaloid, Aspidosperma, Molecular Medicine, Total synthesis, Organic chemistry, biology.organism_classification
Abstract

(±)-Deoxyaspidodispermine, whose (–)-form was isolated from Aspidosperma dispermum and demonstrated as formula (VIIa) of a unique constitution among Aspidosperma alkaloids, was first synthesized under stereocontrol to directly prove the correctness of the proposed structure by chemical means.

Published
1974
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2. Synthetic entry to the hexacyclic Aspidosperma alkaloids. Total synthesis of (±)-4-hydroxyaspidofractinine

Author

Takeshi Oishi, Takeshi Ohnuma, and Yoshio Ban

Subjects
chemistry.chemical_compound, biology, Chemistry, Stereochemistry, Amide, Aspidosperma, Aspidofractinine, Molecular Medicine, Organic chemistry, Total synthesis, Acrylonitrile, biology.organism_classification
Abstract

The pentacyclic intermediate (V) underwent a new type of Michael cyclization on the vinylogous amide system with acrylonitrile and methyl vinyl sulphone to give regio- and stereo-specific bridge formation producing the hexacyclic compounds which constitute the aspidofractinine (I) skeleton.

Published
1973
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