研究者詳細 - 清田　洋正

論文 - 清田　洋正

分割表示 235 件中 141 - 160 件目／全件表示 >>

7,8 beta-dihydroponasterone A, a new phytoecdysteroid from the needles of the Japanese yew, Taxus cuspidata

Qing-Wen Shi, Mei Dong, Chang-Hong Huo, Xiao-Hui Su, Xing Li, Teiko Yamada, Hiromasa Kiyota

JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY 18 ( 5 ) 1081 - 1084 2007年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SOC BRASILEIRA QUIMICA

A new plant ecdysteroid 7,8 beta-dihydroponasterone A, together with ponasterone A, were isolated from the methanol extract of the needles of the Japanese yew, Taxus cuspidata. Their structures were elucidated on the basis of spectroscopic analysis including H-1 NMR, C-13 NMR, H-1-H-1 COSY, NOESY, HMQC and HMBC and confirmed by high-resolution FABMS data.

Web of Science

researchmap

Enantioselective Synthesis of the (1S,5R)-Enantiomer of Litseaverticillols A and B

Akira Morita, Hiromasa Kiyota, Shigefumi Kuwahara

Bioscience, Biotechnology, and Biochemistry 70 ( 10 ) 2564 - 2566 2006年10月

Synthesis of (S)-gizzerosine, a potent inducer of gizzard erosion in chicks

Yasuharu Shimasaki, Hiromasa Kiyota, Minoru Sato, Shigefumi Kuwahara

TETRAHEDRON 62 ( 41 ) 9628 - 9634 2006年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PERGAMON-ELSEVIER SCIENCE LTD

(S)-Gizzerosine, a potent inducer of gizzard erosion in chicks, was synthesized using successive zinc-mediated and palladium-catalyzed coupling reactions as the key steps. (c) 2006 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.tet.2006.07.080

Web of Science

researchmap

P-41 マクロテトラオリド抗生物質polynactin類のアナログ創製研究(ポスター発表の部)

高井健太郎, 花舘忠篤, 大井秀一, 桑原重文, 清田洋正

天然有機化合物討論会講演要旨集 ( 48 ) 361 - 365 2006年9月

Enantio-diffferential approach to identify the target cell for glucosyl jasmonate-type leaf-closing factor, by using fluorescence-labeled probe compounds

Yoko Nakamura, Ryoji Miyatake, Akira Matsubara, Hiromasa Kiyota, Minoru Ueda

TETRAHEDRON 62 ( 37 ) 8805 - 8813 2006年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PERGAMON-ELSEVIER SCIENCE LTD

Potassium beta-D-glucopyranosyl 12-hydroxyjasmonate (1) is a leaf-closing factor of Albizzia plants that induces nyctinastic leaf closure. In this paper, we synthesized probe 3 and its congener 4 by using a pair of enantiomerically pure methyljasmonate that was prepared by using optical resolution, and carried out fluorescence studies using 3 and 4 to identify the target cell of 1. The probe 3 bound to the motor cells of two Albizzia plants, whereas it could not bind to the motor cells of plants belonging to other genus. On the other hand, probe 4 did not bind to the motor cell at all. These results suggested that a specific receptor for I is involved in the motor cell of Albizzia plants. (c) 2006 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.tet.2006.06.092

Web of Science

researchmap

P-37 Fluorescence Studies on the Nyctinasty of Albizzia Plants, An enantio-differential approach Using Enantio-pair of Fluorescence-labeled leaf closing factors

Nakamura Yoko, Miyatake Ryoji, Kiyota Hiromasa, Ueda Minoru

International Symposium on the Chemistry of Natural Products 2006 "P - 37" 2006年7月

New taxanes from the seeds of Taxus mairei

Q. -W. Shi, Z. -P. Li, C. -L. Wang, M. -L. Zhang, N. Choony, H. Kiyota

JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH 8 ( 5 ) 431 - 437 2006年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：TAYLOR & FRANCIS LTD

Two new taxoid metabolites were isolated from the methanol extract of the Taxus mairei seeds. Their structures were established as 2 alpha-hydroxy-9 alpha,10 beta,13 alpha-triacetoxy-5 alpha-cinnamoyloxytaxa-11-en-4 beta,20-epoxide (1) and 2'-acetyl taxol (2) on the basis of spectral analysis.

DOI： 10.1080/10286020500172848

Web of Science

researchmap

Direct observation of the target cell for jasmonate-type leaf-closing factor: genus-specific binding of leaf-movement factors to the plant motor cell

Y Nakamura, H Kiyota, T Kumagai, M Ueda

TETRAHEDRON LETTERS 47 ( 17 ) 2893 - 2897 2006年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PERGAMON-ELSEVIER SCIENCE LTD

We report the synthesis of the novel fluorescence-labeled jasmonate glycoside 2 based on beta-D-glucopyranosyl 12-hydroxy-jasmonate 1, which is a leaf-closing substance of Albizzia Durazz. The fluorescence study using 2 revealed that the target cell for 1 is a motor cell. Probe 2 bound to the motor cells of two plants belonging to genus Albizzia. This result suggested that a receptor for 2, which is common among genus Albizzia would be involved in the nyctinastic leaf movement. (c) 2006 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.tetlet.2006.02.123

Web of Science

researchmap

Spirofungins A and B: a reassignment of Kiyota's spiroketals

LG de Oliveira, LC Dias, H Sakauchi, H Kiyota

TETRAHEDRON LETTERS 47 ( 14 ) 2413 - 2418 2006年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PERGAMON-ELSEVIER SCIENCE LTD

In this letter, we present our results obtained in attempts to synthesize the initially proposed structure of the spiroketal core of spirofungin B. Based on these results, we propose a reassignment for the structures of the spiroketals obtained by Kiyota's group. (c) 2006 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.tetlet.2006.01.153

Web of Science

researchmap

Two new alkaloidal taxoids from the needles of Taxus canadensis

QW Shi, XT Si, YM Zhao, XH Su, Li, X, LO Zamir, T Yamada, H Kiyota

BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY 70 ( 3 ) 732 - 736 2006年3月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：TAYLOR & FRANCIS LTD

Two new taxanes with a dimethylamino group on the C-5 side chain were identified for the first time in the needles of the Canadian yew, Taxus canadensis. Their structures were characterized as 7 beta,10 beta,13 alpha-triacetoxy-5 alpha-(3'-dimethylamino-3'-phenylpropanoyl)- oxy-2 alpha-hydroxy-2(3 -> 20)abeotaxa-4(20),11-dien-9-one (1) and 2 alpha,10 beta-diacetoxy-9 alpha-hydroxy-5 alpha-(3'-dimethylamino-3'-phenylpropanoyl)oxy-3,11-cyclotax-4(20)-en- 13-one (2).

DOI： 10.1271/bbb.70.732

Web of Science

researchmap

Four new epoxy taxanes from needles of Taxus cuspidata (Taxaceae)

QW Shi, CM Cao, JS Gu, H Kiyota

NATURAL PRODUCT RESEARCH 20 ( 2 ) 173 - 179 2006年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：TAYLOR & FRANCIS LTD

Four new epoxy taxoids were isolated from the needles of Taxus cuspidata. Their structures were established as 2 alpha,9 alpha-diacetoxy-5 alpha-cinnamoyloxy-11,12-epoxy-10 beta-hydroxytax-4(20)-en-13-one (1), 2 alpha,10 beta-diacetoxy-5 alpha-cinnamoyloxy-11,12-epoxy-9 alpha-hydroxytax-4(20)-en-13-one (2), 2 alpha,9 alpha-diacetoxy-11,12-epoxy-10 beta,20-dihydroxytax-4-en-13-one (3) and 2 alpha,10 beta-diacetoxy-11,12-epoxy-9 alpha,20-dihydroxytax-4-en-13-one (4) on the basis of spectral analysis including H-1-NMR, C-13-NMR, H-1-H-1- COSY, HSQC, HMBC and HRFABMS. Compounds 3 and 4 are the first example of 11,12-epoxy taxoids with C-4 double bond found in T. cuspidata.

DOI： 10.1080/14786410500049426

Web of Science

researchmap

Synthetic Studies of Naturally Derived Bioactive Compounds of Agricultural Interest

Hiromasa Kiyota*

Bioscience, Biotechnology, and Biochemistry 70 ( 2 ) 317 - 324 2006年2月

1-deoxypaclitaxel and abeo-taxoids from the seeds of Taxus mairei

QW Shi, YM Zhao, XT Si, ZP Li, T Yamada, H Kiyota

JOURNAL OF NATURAL PRODUCTS 69 ( 2 ) 280 - 283 2006年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC

A new paclitaxel derivative and two new 2(3 -> 20)-abeo-taxoids were isolated from a methanol extract of the seeds of Taxus mairei, and their structures were established as 1-deoxypaclitaxel (1), 7 beta,10 beta-diacetoxy-2 alpha,5 alpha,13 alpha-trihydroxy2(3-20)-abeo-taxa-4(20),11-dien-9-one (2), and 2 alpha,13 alpha-diacetoxy-10 beta-hydroxy-2(3 -> 20)-abeo-taxa-4(20),6,11-triene-5,9-dione (3) on the basis of spectroscopic data analysis. Taxane I is the first example of a paclitaxel analogue with a C-1 beta hydrogen substituent. Taxane 3 is an 2(3 -> 20)-abeo-taxane with a rare C-5 ketone and C-6 double bond.

DOI： 10.1021/np0503451

Web of Science

researchmap

Isolation and Structure Revision of 10-Deacetyltaxinine from the Seeds of the Chinese Yew, Taxus mairei

Qing-Wen Shi, Zuo-Ping Li, Ding Zhao, Ji-Shun Gu, Hiromasa Kiyota*

Natural Product Research 20 ( 1 ) 47 - 51 2006年1月

A New Abeotaxane from the sseds of Taxus mairei

Man-Li Zhang, Li-Geng LI, Cong-Mei Cao, Zuo-PIng Li, Qing-Wen Shi, Hiromasa Kiyota

Chinese Chemical Letters 17 ( 1 ) 27 - 30 2006年1月

Chemical Constituents from Genus Achillea

Xiao-Tang Si, Man-Li Zhang, Qing-Wen Shi, Hiromasa Kiyota*

Chemistry and Biodiversity 3 ( 11 ) 1163 - 1180 2006年

Chemical Constituents from Genus Inula

Yong-Min Zhao, Man-Li Zhang, Qing-Wen Shi, Hiromasa Kiyota*

Chemistry and Biodiversity 3 ( 4 ) 371 - 384 2006年

Two New Taxanes from the Branches Bark and Needles of Taxus cuspidata

Cong-Mei Cao, Man-Li Zhang, Yu-Fang Wang, Qing-Wen Shi, Teiko Yamada, Hiromasa Kiyota*

Chemistry and Biodiversity 3 ( 10 ) 1153 - 1161 2006年

Effects of Highly Volatile Organochlorine Solvents on Soil Respiration and Microbial Biomass

Hiromasa Kiyota, Shinjiro Kanazawa, Akihito Yokoyama, Hidenori Wada

International Journal of Soil Science 1 ( 3 ) 235 - 242 2006年

Synthesis and odor description of both enantiomers of methyl 4,5-didehydrojasmonate, a component of jasmin absolute

Yuko Asamitsu, Yoko Nakamura, Minoru Ueda, Shigefumi Kuwahara, Hiromasa Kiyota

CHEMISTRY & BIODIVERSITY 3 ( 6 ) 654 - 659 2006年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：WILEY-V C H VERLAG GMBH

Synthesis of both enantionters of methyl 4,5-didehydrojasmonate (1, Delta(4,5)-MJA; > 99.8% ee), a constituent of jasmin absolute, established the absolute configuration of the natural product, and their odor quality was evaluated. The fragrance of the natural (3S,7R)-enantiomer (a fresh natural, sweet floral fruity odor, reminiscent of Jasmin and Ylang Ylang flower, more intensive and tenacious) was superior to that of the unnatural (3R,7S)-enantiomer (a floral green odor with slight metallic green aspect, less intensive than the natural form) and the racemate (green-floral note, having weak and less volume than methyl jasmonate). Odor difference between natural and unnatural enantiomers of methyl jasmonate (2) is also reported.

DOI： 10.1002/cbdv.200690068

Web of Science

researchmap

　前のページ - 次のページ　

<清田 洋正>

論文 - 清田 洋正

<清田　洋正>

論文 - 清田　洋正