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Featured researches published by Shunji Imai.


Steroids | 1967

Extraction of ponasterone a and ecdysterone from podocarpaceae and related plants

Shunji Imai; Shoji Fujioka; Koji Nakanishi; M. Koreeda; T. Kurokawa

Abstract A general procedure for extracting substances possessing insect moulting hormone activity, i.e., certain polyhydroxy steroids, from plant leaves is described. The screening of plants closely related to Podocarpus Nakaii for the ecdysones and ponasterones has led to the isolation of ponasterone A from P. macrophyllus , P. chinensis , and Taxus cuspidata , and the isolation of ecdysterone from P. macrophyllus and Taxus cuspidata .


Journal of The Chemical Society D: Chemical Communications | 1969

Structure of ajugasterone C, a phytoecdysone with an 11-hydroxy-group

Shunji Imai; E. Murata; S. Fujioka; M. Koreeda; Koji Nakanishi

The new phytoecdysone isolated from Ajuga japonica Miq. is shown to be 2β,3β,11α,14α,20,22-hexahydroxy-5β-cholest-7-en-6-one.


Chemical & Pharmaceutical Bulletin | 1969

Screening Results of Plants for Phytoecdysones

Shunji Imai; Tomoyoshi Toyosato; Michihiko Sakai; Yasuo Sato; Shoji Fujioka; Eiko Murata; Minoru Goto


Chemical & Pharmaceutical Bulletin | 1969

Isolation of Cyasterone and Ecdysterone from Plant Materials

Shunji Imai; Tomoyoshi Toyosato; Michihiko Sakai; Yasuo Sato; Shoji Fujioka; Eiko Murata; Minoru Goto


Tetrahedron Letters | 1968

Isolation of four new phytoecdysones, makisterone A,B,C,D, and the structure of makisterone A, A C28 steroid.☆

Shunji Imai; Mikio Hori; Shoji Fujioka; E. Murata; Minoru Goto; Koji Nakanishi


Chemical & Pharmaceutical Bulletin | 1974

Investigation of Rhubarbs. III. New Purgative Constituents, Sennosides E and F

Haruji Oshio; Shunji Imai; Shoji Fujioka; Tohru Sugawara; Masuo Miyamoto; Makoto Tsukui


Yakugaku Zasshi-journal of The Pharmaceutical Society of Japan | 1967

[Studies on the purgative substances. I. Isolation of sennoiside A, one of the most active principles from Rhubarb].

Masuo Miyamoto; Shunji Imai; Shinohara M; Shoji Fujioka; Minoru Goto


Journal of the American Chemical Society | 1970

Insect hormones. XIX. Structures of stachysterone A, the first natural 27-carbon steroid with a rearranged methyl group, and stachysterone B

Koji Nakanishi; Shunji Imai; Eiko Murata; Shoji. Fujioke; Toshiro. Matsuoka; Masato Koreeda


Chemical & Pharmaceutical Bulletin | 1972

Investigation of Rhubarbs. II. Isolation of Sennoside E, a New Purgative Compound

Haruji Oshio; Shunji Imai; Shoji Fujioka; Tohru Sugawara; Masuo Miyamoto; Makoto Tsukui


Journal of the Mass Spectrometry Society of Japan | 1969

Mass Spectrometric Studies of Ecdysone Derivatives

M. Koreeda; Koji Nakanishi; Shunji Imai; Toshikazu Tsuchiya; N. Wasada

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Shoji Fujioka

Takeda Pharmaceutical Company

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Minoru Goto

Takeda Pharmaceutical Company

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Tadakazu Murata

Takeda Pharmaceutical Company

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Akira Nohara

Takeda Pharmaceutical Company

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Hiroshi Otsuka

Takeda Pharmaceutical Company

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Makoto Tsukui

Takeda Pharmaceutical Company

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Masuo Miyamoto

Takeda Pharmaceutical Company

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Tohru Sugawara

Takeda Pharmaceutical Company

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