研究者詳細 - 清田　洋正

論文 - 清田　洋正

分割表示 235 件中 221 - 235 件目／全件表示 >>

14β-Hydroxytaxusin, a New Taxane from Taxus mairei

Qing-Wen Shi, Takayuki Oritani, Hiromasa Kiyota

Natural Product Letters 12 ( 2 ) 85 - 90 1998年

Synthesis and biological activities of methyl 3,7- and 4,5-didehydrojasmonates

H Kiyota, Y Yoneta, T Oritani

PHYTOCHEMISTRY 46 ( 6 ) 983 - 986 1997年11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

Methyl 3,7-didehydrojasmonate was synthesized as an analogue of methyl epijasmonate. This analogue inhibited the germination of lettuce seed more strongly than methyl jasmonate. Methyl 4,5-didehydrojasmonate was also synthesized and its biological activities were comparable to those of methyl jasmonate. (C) 1997 Elsevier Science Ltd.

DOI： 10.1016/S0031-9422(97)00374-9

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Synthesis of (+)-homononactic acid via iodoetherification

H Kiyota, M Abe, Y Ono, T Oritani

SYNLETT 1997 ( 9 ) 1093 - 1095 1997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：GEORG THIEME VERLAG

(+)-Homononactic acid, one of the monomers of polynactin, and its 8-epimer were synthesized. The key step was cis-selective iodoetherification of the enone or the alpha-silyloxyolefin intermediates constructed with Wittig-Horner or Julia coupling reactions, respectively.

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Stereochemistry of a Unique Tricarbocyclic Compound Prepared by Superacid-Catalyzed Cyclization

Hisahide Tanimoto, Hiromasa Kiyota, Takayuki Oritani, Keita Matsumoto

Synlett 1997 ( 1 ) 121 - & 1997年1月

Synthesis of (±)-Homononactic Acid by Using cis-Selective Iodoetherification

Masaki Abe, Hiromasa Kiyota, Takayuki Oritani

Synlett 1996 ( 8 ) 777 - & 1996年8月

Synthesis and potato tuber-inducing activity of methyl 5',5',5'-trifluorojasmonate

H Kiyota, M Saitoh, T Oritani, T Yoshihara

PHYTOCHEMISTRY 42 ( 5 ) 1259 - 1262 1996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：PERGAMON-ELSEVIER SCIENCE LTD

Methyl 5',5',5'-trifluorojasmonate was synthesized as an antimetabolic analogue of methyl jasmonate. It induced potato tuber formation more effectively than methyl jasmonate and inhibited the growth of rice seedlings and the germination of lettuce and radish seeds. These results suggest that epijasmonic acid itself has potato tuber-inducing activity and that the hydroxyl group of tuberonic acid is not necessary for this activity.

DOI： 10.1016/0031-9422(96)00145-8

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2-Fluoro and 2-Methoxycarbonyl Epoxy-β-ionylideneacetic Acids as Abscisic Acid Analogs

Hiromasa Kiyota, Tadateru Masuda, Jun Chiba, Takayuki Oritani

Bioscience, Biotechnology and Biochemistry 60 ( 7 ) 1076 - 1080 1996年7月

ESTIMATION OF L-GLUTAMINASE AND L-ASPARAGINASE ACTIVITIES IN SOILS BY THE INDOPHENOL METHOD

S KANAZAWA, H KIYOTA

SOIL SCIENCE AND PLANT NUTRITION 41 ( 2 ) 305 - 311 1995年6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：JAPANESE SOC SOIL SCIENCE PLANT NUTRITION

A simple and rapid method was developed for determining L-glutaminase and L-asparaginase activities in soils. It involved colorimetric estimation of NH4+ released by the activity of L-glutaminase and L-asparaginase when soil was incubated with 0.25 M L-glutamine or L-asparagine in 0.1 M phosphate buffer (pH 7.6) and toluene used as a germicide.
The indophenol method was applied to the assay of NH4+ for soil L-glutaminase and L-asparaginase activities. Color development in the indophenol method required one hour. The color development was stable for 2 d and was not appreciably affected by the presence of L-glutamine, L-glutamic acid, L-asparagine, and L-aspartic acid. In addition, no turbidity nor precipitate appeared in the presence of a high concentration (10 mu g) of NH4+-N. The L-glutaminase activity was estimated in three soil samples differing in pH, organic-C content, and land use. The L-glutaminase activity in the three soils ranged from 28 to 1,470 mU (10(-9) mol min(-1) g(-1) of dry soil at 30 degrees C). The optimum pH for the L-glutaminase activity in soils was about 7.5 in phosphate buffer.
The incubation time of L-glutaminase and L-asparaginase can be shortened, because the sensitivity of the indophenol method is about 24 times as high as that of the Nessler method.

DOI： 10.1080/00380768.1995.10419587

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PHEROMONE SYNTHESIS .165. A NEW SYNTHESIS OF (3S,7R,8E,10E)-3,7,9-TRIMETHYL-8,10-DODECADIEN-6-ONE, THE MAJOR COMPONENT OF THE SEX-PHEROMONE OF THE MARITIME PINE SCALE

K MORI, T FURUUCHI, H KIYOTA

LIEBIGS ANNALEN DER CHEMIE 1994 ( 10 ) 971 - 974 1994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：VCH PUBLISHERS INC

(3S,7R,8E,10E)-3,7,9-Trimethyl-8,10-dodecadien-6-one (1), the major component of the female-produced sex pheromone of the maritime pine scale (Matsucoccus feytaudi), was synthesized by starting from epoxide 2, which was obtained from meso-epoxy diacetate (F) by employing enzyme-catalyzed asymmetric hydrolysis as the key step.

DOI： 10.1002/jlac.199419941003

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FACILE PREPARATION OF CONJUGATED DIENES FROM ALLYLIC ALCOHOLS

T KITAHARA, T MATSUOKA, H KIYOTA, Y WARITA, H KURATA, A HORIGUCHI, K MORI

SYNTHESIS-STUTTGART 1994 ( 7 ) 692 - 694 1994年7月

SYNTHESIS OF (2S,4R,5S)-2,4,6-TRIMETHYL-5-HEPTANOLIDE, A SEX-PHEROMONE COMPONENT FOR MACROCENTRUS-GRANDII

H KIYOTA, K MORI

BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY 58 ( 6 ) 1120 - 1122 1994年6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

(2S,4R,5S)-2,4,6-Trimethyl-5-heptanolide (1), a ses pheromone component for Macrocentrus grandii, aas synthesized by starting from methyl (R)-citronellate (2) and employing bromolactonization (10-->11) as the key reaction.

DOI： 10.1271/bbb.58.1120

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Synthesis of the Enantiomers of syn-4-Methyl-5-nonanol to Determine the Absolute Configuration of the Naturally Occurring (4S,5S) Isomer Isolated as the Male-Produced Pheromone Compound of Rhynchophorus vulneratus and Metamasius hemipterus 査読

Kenji Mori, Hiromasa Kiyota, Christian Malosse, Didier Rochat

Liebigs Annalen der Chemie 1993 1201 - 1204 1993年10月

Synthesis of the Stereoisomers of 3-Methyl-4-octanol to Determine the Absolute Configuration of the Naturally Occurring (3S.4S)-Isomer Isolated as the Male-Produced Aggregation Pheromone of the African Palm Weevil, Rhynchophorus phoenicis 査読

Kenji Mori, Hiromasa Kiyota, Didier Rochat

Liebigs Annalender Chemie 1993 865 - 870 1993年7月

A New Synthesis of (3S,4R)-8-Nonene-3,4-diol, the key Intermediate for the Synthesis of (+)-endo-Brevicomin 査読

Kenji Mori, Hiromasa Kiyota

Liebigs Annalen der Chemie 1992 989 - 992 1992年8月

Synthesis of Oxygenated Eremophilanes, Gigantenone, Phomenone and Phaseolinone, Phytotoxins from Pathogenic Fungi 査読

Takeshi Kitahara, Hiromasa Kiyota, Hitoshi Kurata, Kenji Mori

Tetrahedron 47 ( 9 ) 1649 - 1654 1991年3月

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