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1

Condensations of brominated products of o-acetylbenzophenone with several primary amines

Seiko Nan'Ya, Hirofumi Ishida, Ester J. Moiji, Yasuo Butsugan, Ashok C. Bajji

Journal:

Journal of Heterocyclic Chemistry

Year:

1994

File:

PDF, 186 KB

1994

2

Nitrogen-Rich Mesoionic Compounds from 1,3-Diaryl-5-chlorotetrazolium Salts and Nitrogen Nucleophiles − Synthesis and Properties of 1,3-Diaryl-5-azidotetrazolium Salts

Shuki Araki, Kaori Yamamoto, Misako Yagi, Tomoko Inoue, Hiroyo Fukagawa, Hiromi Hattori, Hatsuo Yamamura, Masao Kawai, Yasuo Butsugan

Journal:

European Journal of Organic Chemistry

Year:

1998

Language:

english

File:

PDF, 500 KB

english, 1998

3

Optical resolution and absolute configuration of N-Benzyloxycarbonyl-α-alkoxyglycines

Masao Kawai, Keiichi Yamada, Kouji Hosoda, Yasuhiro Omori, Shuji Kato, Nobuhiro Nagayama, Seigo Masui, Masao Kamiya, Hatsuo Yamamura, Shuki Araki, Yasuo Butsugan

Journal:

Year:

1999

Language:

english

File:

PDF, 129 KB

english, 1999

4

Carbonsäureester aus Aldehyden und Grignard-Verbindungen

Doz. Dr. Anton Rieker (Vortr.), Dr. Yasuo Butsugan

Journal:

Angewandte Chemie

Year:

1971

Language:

german

File:

PDF, 226 KB

german, 1971

5

Samarium(II)-induced coupling of acid chlorides with allylic halides

Shuki Araki, Masahiro Hatano, Hirokazu Ito, Yasuo Butsugan

Journal:

Applied Organometallic Chemistry

Year:

1988

Language:

english

File:

PDF, 198 KB

english, 1988

6

Gallium-induced Barbier coupling of carbonyl compounds with allyl iodide

Shuki Araki, Hirokazu Ito, Yasuo Butsugan

Journal:

Applied Organometallic Chemistry

Year:

1988

Language:

english

File:

PDF, 244 KB

english, 1988

7

Solid-state conformations of α-Aminoisobutyryl-L-prolyl sequences: Crystal structure of Boc-Aib-L-Pro-OBzl

Masao Kawai, Yasuo Butsugan, Keiichi Fukuyama, Tooru Taga

Journal:

Year:

1987

Language:

english

File:

PDF, 613 KB

english, 1987

8

Crystal structures of Boc-D- and L-Iva-L-Pro-OBZl: Unturned conformation of Aib-Pro sequence unaffected by replacement of Me with Et in Aib

Masao Kawai, Yoshimasa Omori, Hatsuo Yamamura, Yasuo Butsugan, Tooru Taga, Yoshihisa Miwa

Journal:

Year:

1993

Language:

english

File:

PDF, 392 KB

english, 1993

9

Syntheses and Structures of Transition-Metal Complexes of Mesoionic Olate, Thiolate, Selenolate, and Cyclopentadienide

Shuki Araki, Yasuo Butsugan

Journal:

European Journal of Inorganic Chemistry

Year:

1993

Language:

english

File:

PDF, 332 KB

english, 1993

10

Synthesis and Chemical Transformations of 1,3-Diaryltetrazolium Salts. Preparation of Mercury(II) and Palladium(II) Complexes of 1,3-Diaryltetrazolylene and Reactions of 5-Substituted 1,3-Diphenyltetrazolium Salts with Nucleophiles

Shuki Araki, Yasumi Wanibe, Fujio Uno, Akinao Morikawa, Kaori Yamamoto, Kyoko Chiba, Yasuo Butsugan

Journal:

European Journal of Inorganic Chemistry

Year:

1993

Language:

english

File:

PDF, 754 KB

english, 1993

11

Formation of 1,3-dienetricarbonyliron complexes from the reaction of dipotassium tetracarbonylferrate with allylic compounds

Yasuo Butsugan, Akihiko Yamashita, Shuki Araki

Journal:

Journal of Organometallic Chemistry

Year:

1985

Language:

english

File:

PDF, 398 KB

english, 1985

12

Allylation of quinones by allylic indium reagents

Shuki Araki, Nobuhito Katsumura, Yasuo Butsugan

Journal:

Journal of Organometallic Chemistry

Year:

1991

Language:

english

File:

PDF, 1.03 MB

english, 1991

13

Physalins N and O from Physalis alkekengi

Masao Kawai, Toichi Ogura, Bunsho Makino, Akihide Matsumoto, Hatsuo Yamamura, Yasuo Butsugan, Mitsuo Hayashi

Journal:

Year:

1992

Language:

english

File:

PDF, 399 KB

english, 1992

14

Upon ‘physalin L’ isolated from Physalis minima

Masao Kawai, Bunsho Makino, Hatsuo Yamamura, Yasuo Butsugan

Journal:

Year:

1996

Language:

english

File:

PDF, 199 KB

english, 1996

15

New physalins possessing an additional carbon-carbon bond from Physalis alkekengi var. francheti

Bunsho Makino, Masao Kawai, Koji Kito, Hatsuo Yamamura, Yasuo Butsugan

Journal:

Year:

1995

Language:

english

File:

PDF, 642 KB

english, 1995

16

Synthesis and alkali metal ion binding of poly(3,6-anhydro)-α-cyclodextrins

Hatsuo Yamamura, Hideki Nagaoka, Masao Kawai, Yasuo Butsugan, Kahee Fujita

Journal:

Tetrahedron Letters

Year:

1995

Language:

english

File:

PDF, 133 KB

english, 1995

17

Selective reduction of organic compounds with indium hydride reagents

Masafumi Yamada, Koji Tanaka, Shuki Araki, Yasuo Butsugan

Journal:

Tetrahedron Letters

Year:

1995

Language:

english

File:

PDF, 185 KB

english, 1995

18

Indium-mediated reaction of 1,3-dichloro- and 1,3-dibromopropenes with carbonyl compounds. Generation of novel 3,3-diindiopropene

Shuki Araki, Tsunehisa Hirashita, Hidetaka Shimizu, Hatsuo Yamamura, Masao Kawai, Yasuo Butsugan

Journal:

Tetrahedron Letters

Year:

1996

Language:

english

File:

PDF, 170 KB

english, 1996

19

Samarium(II)-mediated reaction of allylic phosphate esters with carbonyl compounds: A new method for “Umpolung” of allylic phosphates

Shuki Araki, Masahiro Hatano, Hirokazu Ito, Yasuo Butsugan

Journal:

Journal of Organometallic Chemistry

Year:

1987

Language:

english

File:

PDF, 534 KB

english, 1987

20

A New physalin from Physalis alkekengi: structure of physalin L

Masao Kawai, Taketoshi Matsuura, Seiji Kyuno, Hideto Matsuki, Motoo Takenaka, Takayuki Katsuoka, Yasuo Butsugan, Kazuki Saito

Journal:

Year:

1987

Language:

english

File:

PDF, 466 KB

english, 1987

21

Benzilic acid rearrangement-type reaction of physalins to neophysalins. Structural revision of one of the dehydration products of physalin A

Masao Kawai, Toichi Ogura, Yasuo Butsugan, Tooru Taga, Mitsuo Hayashi

Journal:

Year:

1991

Language:

english

File:

PDF, 458 KB

english, 1991

22

Carboindation of alkynols. A facile synthesis of yomogi alcohol

Shuki Araki, Akira Imai, Ken Shimizu, Yasuo Butsugan

Journal:

Tetrahedron Letters

Year:

1992

Language:

english

File:

PDF, 133 KB

english, 1992

23

Barbier-Grignard-type allylation of aldehydes with metallic antimony

Yasuo Butsugan, Hirokazu Ito, Shuki Araki

Journal:

Tetrahedron Letters

Year:

1987

Language:

english

File:

PDF, 117 KB

english, 1987

24

Quinonoid mesoions, (2,3-diphenyltetrazol-5-ylio)phenolates

Shuki Araki, Naomitsu Aoyama, Yasuo Butsugan

Journal:

Tetrahedron Letters

Year:

1987

Language:

english

File:

PDF, 556 KB

english, 1987

25

Indium-induced allylation of acid anhydrides: A facile synthesis of allylated butenolides and phthalides

Shuki Araki, Nobuhito Katsumura, Hirokazu Ito, Yasuo Butsugan

Journal:

Tetrahedron Letters

Year:

1989

Language:

english

File:

PDF, 122 KB

english, 1989

26

Electrophilic substitution reaction of meso-ionic sesquifulvalene

Shuki Araki, Yasuo Butsugan

Journal:

Tetrahedron Letters

Year:

1984

Language:

english

File:

PDF, 229 KB

english, 1984

27

Intramolecular cyclization of a dieno-nitrile: synthesis of a new monoterpene alkaloid

Yasuo Butsugan, Shigeo Yoshida, Masao Muto, Tadaaki Bito, Teruo Matsuura, Ruka Nakashima

Journal:

Tetrahedron Letters

Year:

1971

Language:

english

File:

PDF, 94 KB

english, 1971

28

Ester aus sterisch gehinderten grignard-verbindungen und “oxidierenden” aldehyden

Anton Rieker, Yasuo Butsugan, Mamoru Shimizu

Journal:

Tetrahedron Letters

Year:

1971

Language:

german

File:

PDF, 216 KB

german, 1971

29

Optical resolution of N-carbobenzoxy-α-methoxyglycine

Masao Kawai, Yoshimasa Omori, Hatsuo Yamamura, Yasuo Butsugan

Journal:

Tetrahedron: Asymmetry

Year:

1992

Language:

english

File:

PDF, 195 KB

english, 1992

30

1H NMR spectral analysis of physalin A, a 13,14-seco-16,24-cyclosteroid, based on crystal structure of (25R)-2,3,25,27-tetrahydrophysalin a dimethanol solvate

Masao Kawai, Tooru Taga, Yoshihisa Miwa, Yasuo Butsugan

Journal:

Journal of Chemical Crystallography

Year:

1992

Language:

english

File:

PDF, 343 KB

english, 1992

31

Stereochemistry of protected ornithine side chains in gramicidin S derivatives and their resistance to N-methylation

Masao Kawai, Tatsuo Yamamoto, Keiichi Yamada, Masashi Yamaguchi, Shigehiro Kurobe, Hatsuo Yamamura, Shuki Araki, Yasuo Butsugan, Kyoko Kobayashi, Ryoichi Katakai, Kazuki Saito, Terumi Nakajima

Journal:

International Journal of Peptide Research and Therapeutics

Year:

1998

Language:

english

File:

PDF, 578 KB

english, 1998

32

A Barbier allylation and a Reformatsky reaction of carbonyl compounds mediated by indium(I) iodide

Shuki Araki, Hirokazu Ito, Nobuhito Katsumura, Yasuo Butsugan

Journal:

Journal of Organometallic Chemistry

Year:

1989

Language:

english

File:

PDF, 363 KB

english, 1989

33

Reaction of α-halo organoindium reagents with carbonyl compounds and electron-deficient alkenes

Shuki Araki, Tsunehisa Hirashita, Ken Shimizu, Takahiro Ikeda, Yasuo Butsugan

Journal:

Year:

1996

Language:

english

File:

PDF, 694 KB

english, 1996

34

Stereodivergent allylindation of cyclopropenes. Remarkable stereodirection and acceleration by neighbouring carboxyl and hydroxyl groups

Shuki Araki, Hiroyuki Nakano, Kandasamy Subburaj, Tsunehisa Hirashita, Kensuke Shibutani, Hatsuo Yamamura, Masao Kawai, Yasuo Butsugan

Journal:

Tetrahedron Letters

Year:

1998

Language:

english

File:

PDF, 248 KB

english, 1998

35

Stereochemistry of protected ornithine side chains in gramicidin S derivatives and their resistance to N-methylation

Masao Kawai, Tatsuo Yamamoto, Keiichi Yamada, Masashi Yamaguchi, Shigehiro Kurobe, Hatsuo Yamamura, Shuki Araki, Yasuo Butsugan, Kyoko Kobayashi, Ryoichi Katakai, Kazuki Saito, Terumi Nakajima

Journal:

International Journal of Peptide Research and Therapeutics

Year:

1998

Language:

english

File:

PDF, 103 KB

english, 1998

36

Structures of two alkaline autoxidation products of BHA, a widely used antioxidant

Masao Kawai, Masao Muto, Yoshiaki Murase, Shuki Araki, Komei Kafuku, Hiroshi Yoshioka, Kazumi Nakatsu, Yasuo Butsugan

Journal:

Journal of Chemical Crystallography

Year:

1999

Language:

english

File:

PDF, 67 KB

english, 1999

37

Indium in organic synthesis: indium-mediated allylation of carbonyl compounds

Araki, Shuki, Ito, Hirokazu, Butsugan, Yasuo

Journal:

Journal of Organic Chemistry

Year:

1988

Language:

english

File:

PDF, 324 KB

english, 1988

38

Double 1,3-dipolar cycloadditions of meso-ionic heterocycles with N-phenylmaleimide

Seiko Nan'ya, Shinya Goto, Yasuo Butsugan

Journal:

Journal of Heterocyclic Chemistry

Year:

1990

File:

PDF, 113 KB

1990

39

Isoindole derivatives from o-diacylbenzenes and aromatic amines

Seiko Nan'ya, Takashi Fujii, Yasuo Butsugan

Journal:

Journal of Heterocyclic Chemistry

Year:

1990

File:

PDF, 156 KB

1990

40

Double 1,3-dipolar cycloadditions of meso-ionic heterocycles to N-substituted maleimides

Seiko Nan'ya, Yoshinori Kurachi, Yasuo Butsugan

Journal:

Journal of Heterocyclic Chemistry

Year:

1991

File:

PDF, 204 KB

1991

41

Products formed by the reaction of o-diacylbenzenes with primary amines

Seiko Nan'Ya, Takeo Kitahara, Yasuo Butsugan

Journal:

Journal of Heterocyclic Chemistry

Year:

1992

File:

PDF, 134 KB

1992

42

Isoindole derivatives from 2-isonicotinoyl-acetophenone with ammonia and its derivatives

Seiko Nan'Ya, Takeo Kitahara, Taro Kuroda, Yasuo Butsugan

Journal:

Journal of Heterocyclic Chemistry

Year:

1992

File:

PDF, 196 KB

1992

43

Condensation products of 2-bromo-3-substituted-inden-1-ones with several primary amines

Seiko Nan'ya, Takeo Kitahara, Kenichi Fujii, Ashok C. Bajji, Yasuo Butsugan

Journal:

Journal of Heterocyclic Chemistry

Year:

1992

File:

PDF, 246 KB

1992

44

Synthesis of indeno[2,1-b][1,4]benzothiazine derivatives from 2-bromoinden-1-ones

Ashok C. Bajji, Seiko Nan'ya, Yasuo Butsugan

Journal:

Journal of Heterocyclic Chemistry

Year:

1993

File:

PDF, 168 KB

1993

45

Formation of isoindoline derivatives from o-bromoacetylbenzophenones

Seiko Nan'Ya, Hirofumi Ishida, Yasuo Butsugan

Journal:

Journal of Heterocyclic Chemistry

Year:

1994

File:

PDF, 133 KB

1994

46

Reactions of o-bromoacetylacylphenones with several primary amines

Seiko Nan'ya, Hirofumi Ishida, Kiyoshi Kanie, Noriyuki Ito, Yasuo Butsugan

Journal:

Journal of Heterocyclic Chemistry

Year:

1995

File:

PDF, 289 KB

1995

47

Preparation and opioid activities of N-methylated analogs of [D-Ala2, Leu5]enkephalin

MASAO KAWAI, NORIHITO FUKUTA, NAOKI ITO, TAKATOYO KAGAI, YASUO BUTSUGAN, MUTSUMI MARUYAMA, YOSHIHISA KUDO

Journal:

Chemical Biology & Drug Design

Year:

1990

Language:

english

File:

PDF, 747 KB

english, 1990

48

A facile synthesis of optically active 3-ethyl- and 3-butylphthalides via catalytic enantioselective addition of dialkylzinc reagents to o-phthalaldehyde

Watanabe, Makoto, Hashimoto, Norifumi, Araki, Shuki, Butsugan, Yasuo

Journal:

Journal of Organic Chemistry

Year:

1992

Language:

english

File:

PDF, 442 KB

english, 1992

49

Two alternative conformational states of ?,?-dialkylglycyl-L-prolyl sequences governed by presence/absence of an NH group directly following the proline residue. X-Ray crystal and molecular structures of Boc-D-Iva-L-Pro-NHBzl and Boc-L-Iva-L-Pro-NHBzl

Kawai, Masao, Omori, Yoshimasa, Yamamura, Hatsuo, Butsugan, Yasuo, Taga, Tooru, Miwa, Yoshihisa

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1995

Language:

english

File:

PDF, 1007 KB

english, 1995

50

Cyclopropanation of electron-deficient alkenes and wideqvist-type synthesis of cyclopropanes mediated by indium metal

Araki, Shuki, Butsugan, Yasuo

Journal:

Journal of the Chemical Society Chemical Communications

Year:

1989

Language:

english

File:

PDF, 164 KB

english, 1989

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