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1

Reaction of Benzyne with Salicylaldehydes: General Synthesis of Xanthenes, Xanthones, and Xanthols

Okuma, Kentaro, Nojima, Akiko, Matsunaga, Nahoko, Shioji, Kosei

Journal:

Organic Letters

Year:

2009

Language:

english

File:

PDF, 117 KB

english, 2009

2

Synthesis of 3,1-Benzothiazines from 2-Alkenyl- and 2-Alkynylanilides and Lawesson Reagent

Okuma, Kentaro, Ozaki, Saori, Nagahora, Noriyoshi, Shioji, Kosei

Journal:

Year:

2011

Language:

english

File:

PDF, 711 KB

english, 2011

3

Tandem Reaction of Arynes with Tertiary Amines and Aldehydes: Formation of 9- and 10-Membered Dibenzo[1,5]oxaza Heterocycles

Okuma, Kentaro, Kinoshita, Hiroaki, Nagahora, Noriyoshi, Shioji, Kosei

Journal:

European Journal of Organic Chemistry

Year:

2016

Language:

english

File:

PDF, 896 KB

english, 2016

4

ChemInform Abstract: Tandem Reaction of Arynes with Tertiary Amines and Aldehydes: Formation of 9- and 10-Membered Dibenzo[1,5]oxaza Heterocycles.

Okuma, Kentaro, Kinoshita, Hiroaki, Nagahora, Noriyoshi, Shioji, Kosei

Journal:

Year:

2016

File:

PDF, 28 KB

2016

5

Reactivity of a trivalent phosphorus radical cation as an electrophile toward pyridine derivatives

Shinro Yasui, Kosei Shioji, Munekazu Tsujimoto, Atsuyoshi Ohno

Journal:

Heteroatom Chemistry

Year:

2000

Language:

english

File:

PDF, 185 KB

english, 2000

6

Dichotomy in the Reactivity of Trivalent Phosphorus Compounds Z3P (Z = Ph, nBu, OR) Observed in the Photoreaction with a Ruthenium Complex

Shinro Yasui, Munekazu Tsujimoto, Kosei Shioji, Atsuyoshi Ohno

Journal:

European Journal of Inorganic Chemistry

Year:

1997

Language:

english

File:

PDF, 884 KB

english, 1997

7

Synthesis and Reaction of α-Dithiolactone

Toshiyuki Shigetomi, Hiroe Soejima, Yoshinori Nibu, Kosei Shioji, Kentaro Okuma, Yoshinobu Yokomori

Journal:

Chemistry - A European Journal

Year:

2006

Language:

english

File:

PDF, 216 KB

english, 2006

8

ChemInform Abstract: Formation of 5-Methylene-1,3-dioxepanes by the Reaction of 2,2,2-Triphenyl-1,2λ5-oxaphospholanes with Paraformaldehyde.

Kentaro Okuma, Yuichiro Tanaka, Ichiro Shuzui, Kosei Shioji

Journal:

Year:

1999

File:

PDF, 34 KB

1999

9

ChemInform Abstract: Regioselective Synthesis of 1H-2-Benzoselenopyrans. Reaction of 4,4′-Dimethoxyselenobenzophenone with Acetylenes.

Kentaro Okuma, Yuji Koga, Yayoi Furunushi, Kazuki Kojima, Kosei Shioji

Journal:

Year:

1999

File:

PDF, 31 KB

1999

10

ChemInform Abstract: Reaction of Sterically Congested Thiones with Benzyne. The First Isolation of a Thioaldehyde—Benzyne Adduct.

Kentaro Okuma, Shinya Sonoda, Yuji Koga, Kosei Shioji

Journal:

Year:

2000

File:

PDF, 30 KB

2000

11

ChemInform Abstract: Reaction of Electronically Stabilized Thiones with Benzyne. The Isolation of Thiobenzophenone—Benzyne and Thiopivalophenone—Benzyne Adducts.

Kentaro Okuma, Kyoko Shiki, Shinya Sonoda, Yuji Koga, Kosei Shioji, Tsugio Kitamura, Yuzo Fujiwara, Yoshinobu Yokomori

Journal:

Year:

2000

File:

PDF, 33 KB

2000

12

ChemInform Abstract: Novel Ring Contraction of Dioxepanes to Tetrahydropyrans. Reaction of Dioxepanes with Trimethylsilyl Trifluoromethanesulfonate.

Kentaro Okuma, Tetsuji Hayano, Kosei Shioji, Haruo Matsuyama

Journal:

Year:

2000

File:

PDF, 29 KB

2000

13

ChemInform Abstract: Reaction of Selenobenzophenones with Olefins. Formation of 1H-2-Benzoselenopyrans. Reaction of 1H-2-Benzoselenopyrans with Diazoalkanes.

Kentaro Okuma, Yuji Koga, Kazuki Kojima, Kosei Shioji, Haruo Matsuyama, Yoshinobu Yokomori

Journal:

Year:

2000

File:

PDF, 34 KB

2000

14

ChemInform Abstract: Oxidation of 1H-2-Benzoselenopyrans. Generation of Benzoselenophenes, Benzaldehydes, and Benzophenones.

Kentaro Okuma, Kazuki Kojima, Yuji Koga, Kosei Shioji

Journal:

Year:

2000

File:

PDF, 29 KB

2000

15

ChemInform Abstract: A New Simple Synthesis of cis- and trans-3,5-Di-tert-butyl-3,5-diaryl-1,2,4-trithiolanes from Ketones and Tetraphosphorus Decasulfide.

Kentaro Okuma, Shinji Shibata, Kosei Shioji, Yoshinobu Yokomori

Journal:

Year:

2000

File:

PDF, 27 KB

2000

16

ChemInform Abstract: Lipase-Catalyzed Kinetic Resolution of Racemic Seven-Membered Substituted Lactones.

Kosei Shioji, Ayako Matsuo, Kentaro Okuma, Kaoru Nakamura, Atsuyoshi Ohno

Journal:

Year:

2001

File:

PDF, 29 KB

2001

17

ChemInform Abstract: Lipase-Catalyzed Kinetic Resolution of P-Chiral Phosphorus Compounds: Enantiopreference of Pseudomonas Lipase and Candida antarctica Lipase.

Kosei Shioji, Yuichiro Ueno, Yoshimitsu Kurauchi, Kentaro Okuma

Journal:

Year:

2002

File:

PDF, 29 KB

2002

18

Novel Synthesis of 1,3-Disubstituted Alkyl- and Aralkylnaphthalenes from Methylenetriphenylphosphorane, 1,1-Disubstituted Epoxides, Paraformaldehyde, and Trimethylsilyl Triflate.

Kentaro Okuma, Yoshitaka Hirose, Kosei Shioji

Journal:

Year:

2002

File:

PDF, 29 KB

2002

19

Novel Synthesis of Methylenecyclobutanols and 4-Methylenetetrahydrofurans from γ-Oxide Ylides.

Kentaro Okuma, Yoshihiro Kamahori, Kimiko Tsubakihara, Kanami Yoshihara, Yuichiro Tanaka, Kosei Shioji

Journal:

Year:

2003

File:

PDF, 150 KB

2003

20

Wittig Reaction by Using DBU as a Base.

Kentaro Okuma, Osami Sakai, Kosei Shioji

Journal:

Year:

2003

File:

PDF, 96 KB

2003

21

Synthesis of 5-(Alkylphenylphosphoryl)-5-methyl-3,4-dihydro-2H-pyrroline N-Oxide as a New Spin Trapping Reagent.

Kosei Shioji, Shigeyuki Tsukimoto, Hidehiko Tanaka, Kentaro Okuma

Journal:

Year:

2003

File:

PDF, 72 KB

2003

22

Synthesis of 1,2,4-Trithiolanes from Thione S-Oxides and Lawesson Reagent at Room Temperature.

Kentaro Okuma, Toshiyuki Shigetomi, Shinji Shibata, Kosei Shioji

Journal:

Year:

2004

File:

PDF, 84 KB

2004

23

Selenobenzophenones and Diazoalkanes: Isolation of Tetraarylethylenes by the Reaction of Benzophenone Hydrazones with Diselenium Dibromide.

Kentaro Okuma, Kazuki Kojima, Kosuke Oyama, Kento Kubo, Kosei Shioji

Journal:

Year:

2004

File:

PDF, 151 KB

2004

24

Synthesis of 1,3,4-Thiadiazoles from Aldehyde Hydrazones.

Kentaro Okuma, Kazuko Nagakura, Yasutaka Nakajima, Kento Kubo, Kosei Shioji

Journal:

Year:

2005

File:

PDF, 13 KB

2005

25

Reaction of Sterically Crowded Selenoketones with Propiolic Acid.

Kentaro Okuma, Shinobu Maekawa, Yoshinori Nito, Kosei Shioji

Journal:

Year:

2005

File:

PDF, 18 KB

2005

26

Reaction of Ketone Hydrazones with Diselenium Dihalides: Simple Synthesis of Δ3-1,3,4-Selenadiazolines and 2,5-Diarylselenophenes.

Kentaro Okuma, Toshiharu Izaki, Kento Kubo, Kosei Shioji, Yoshinobu Yokomori

Journal:

Year:

2005

File:

PDF, 36 KB

2005

27

Reaction of 3,3,5,5-Tetramethylthiolane-2,4-dithione with Benzyne: Novel Formation of Benzodithiole.

Kentaro Okuma, Taeko Tsubone, Toshiyuki Shigetomi, Kosei Shioji, Yoshinobu Yokomori

Journal:

Year:

2005

File:

PDF, 13 KB

2005

28

ChemInform Abstract: Palladium-Free Zinc-Mediated Hydroamination of Alkynes: Efficient Synthesis of Indoles from 2-Alkynylaniline Derivatives.

Kentaro Okuma, Jun-ichi Seto, Ken-ichi Sakaguchi, Saori Ozaki, Noriyoshi Nagahora, Kosei Shioji

Journal:

Year:

2009

File:

PDF, 25 KB

2009

29

ChemInform Abstract: Cascade Approach to Trichloroalkyl Phenyl Ethers from Benzyne, Epoxides, and Chloroform.

Kentaro Okuma, Haruna Hino, Ayumi Sou, Noriyoshi Nagahora, Kosei Shioji

Journal:

Year:

2010

File:

PDF, 31 KB

2010

30

ChemInform Abstract: A Highly Effective One-Pot Synthesis of Quinolines from 2-Alkynylnitrobenzenes.

Kentaro Okuma, Saori Ozaki, Jun-ichi Seto, Noriyoshi Nagahora, Kosei Shioji

Journal:

Year:

2010

File:

PDF, 22 KB

2010

31

ChemInform Abstract: Reaction of Thiocamphor with Disulfur Dichloride: Novel Formation of α-Disulfine.

Kentaro Okuma, Toshiaki Tsubota, Miki Tabuchi, Masayuki Kanto, Noriyoshi Nagahora, Kosei Shioji, Yoshinobu Yokomori

Journal:

Year:

2010

File:

PDF, 27 KB

2010

32

ChemInform Abstract: Three Component Reaction of Arynes with Cyclic Ethers and Active Methines: Synthesis of ω-Trichloroalkyl Phenyl Ethers.

Kentaro Okuma, Yuta Fukuzaki, Akiho Nojima, Ayumi Sou, Haruna Hino, Nahoko Matsunaga, Noriyoshi Nagahora, Kosei Shioji, Yoshinobu Yokomori

Journal:

Year:

2011

Language:

english

File:

PDF, 37 KB

english, 2011

33

ChemInform Abstract: Chemoselective Synthesis of Quinoline N-Oxides from 3-(2-Nitrophenyl)-3-hydroxypropanones.

Kentaro Okuma, Jun-ichi Seto, Noriyoshi Nagahora, Kosei Shioji

Journal:

Year:

2011

File:

PDF, 33 KB

2011

34

ChemInform Abstract: Reaction of Benzyne with Formamides and Acetylimidazole.

Kentaro Okuma, Akiko Nojima, Yuki Nakamura, Nahoko Matsunaga, Noriyoshi Nagahora, Kosei Shioji

Journal:

Year:

2011

File:

PDF, 25 KB

2011

35

ChemInform Abstract: Reaction of Arynes with Amino Acid Esters.

Kentaro Okuma, Nahoko Matsunaga, Noriyoshi Nagahora, Kosei Shioji, Yoshinobu Yokomori

Journal:

Year:

2011

File:

PDF, 31 KB

2011

36

ChemInform Abstract: Synthesis of 3,1-Benzothiazines from 2-Alkenyl- and 2-Alkynylanilides and Lawesson Reagent.

Kentaro Okuma, Saori Ozaki, Noriyoshi Nagahora, Kosei Shioji

Journal:

Year:

2011

File:

PDF, 41 KB

2011

37

First Isolation of Thione-Propiolic Acid Adducts − Synthesis of Thiodioxenones

Kentaro Okuma, Shinobu Maekawa, Shinji Shibata, Kosei Shioji, Thoru Inoue, Tsutomu Kurisaki, Hisanobu Wakita, Yoshinobu Yokomori

Journal:

European Journal of Organic Chemistry

Year:

2003

Language:

english

File:

PDF, 90 KB

english, 2003

38

Selenobenzophenones and Diazoalkanes: Isolation of Tetraarylethylenes by the Reaction of Benzophenone Hydrazones with Diselenium Dibromide

Kentaro Okuma, Kazuki Kojima, Kosuke Oyama, Kento Kubo, Kosei Shioji

Journal:

European Journal of Organic Chemistry

Year:

2004

Language:

english

File:

PDF, 125 KB

english, 2004

39

Reactivity of a phosphoranyl radical generated by photoreaction of phenyl diphenylphosphinite with 10-methylacridinium iodide. α-Scission vs. single electron transfer

Shinro Yasui, Kosei Shioji, Atsuyoshi Ohno

Journal:

Heteroatom Chemistry

Year:

1994

Language:

english

File:

PDF, 484 KB

english, 1994

40

Dediazoniation of arenediazonium salts with trivalent-phosphorus compounds. Tool for examination of the reactivity of phosphorus-centered radicals

Shinro Yasui, Kosei Shioji, Atsuyoshi Ohno

Journal:

Heteroatom Chemistry

Year:

1995

Language:

english

File:

PDF, 885 KB

english, 1995

41

Reaction of diphenylphosphine oxide with a 10-methylacridinium salt. Reversible formation of a PC covalent bond

Shinro Yasui, Kosei Shioji, Atsuyoshi Ohno, Masakuni Yoshihara

Journal:

Heteroatom Chemistry

Year:

1995

Language:

english

File:

PDF, 481 KB

english, 1995

42

Chemoselective synthesis of quinoline N-oxides from 3-(2-nitrophenyl)-3-hydroxypropanones

Kentaro Okuma, Jun-ichi Seto, Noriyoshi Nagahora, Kosei Shioji

Journal:

Journal of Heterocyclic Chemistry

Year:

2010

Language:

english

File:

PDF, 163 KB

english, 2010

43

An intramolecular Arbuzov rearrangement initiated by anodic oxidation

Shinro Yasui, Kosei Shioji, Munekazu Tsujimoto, Atsuyoshi Ohno

Journal:

Tetrahedron Letters

Year:

1996

Language:

english

File:

PDF, 173 KB

english, 1996

44

Synthesis and properties of fluorescence probe for detection of peroxides in mitochondria

Kosei Shioji, Yu Oyama, Kentaro Okuma, Hiroyuki Nakagawa

Journal:

Bioorganic & Medicinal Chemistry Letters

Year:

2010

Language:

english

File:

PDF, 626 KB

english, 2010

45

Reaction of 3,3-di-tert-butylthiirane-2-thione S-oxide (α-dithiolactone S-oxide): synthesis of thiolato sulfinato-platinum and palladium complexes

Toshiyuki Shigetomi, Kosei Shioji, Kentaro Okuma, Tohru Inoue, Yoshinobu Yokomori

Journal:

Year:

2007

Language:

english

File:

PDF, 347 KB

english, 2007

46

Novel formation of indoles and 3,1-benzoxazines from o-alkenylanilides and dimethyl(methylthio)sulfonium trifluoromethanesulfonate

Kentaro Okuma, Takumi Yasuda, Itsuki Takeshita, Kosei Shioji, Yoshinobu Yokomori

Journal:

Year:

2007

Language:

english

File:

PDF, 329 KB

english, 2007

47

Reaction of selenofenchone with propiolic acid: first instance of Wagner–Meerwein rearrangement in selone

Kentaro Okuma, Yuichi Mori, Toshiyuki Shigetomi, Miki Tabuchi, Kosei Shioji, Yoshinobu Yokomori

Journal:

Tetrahedron Letters

Year:

2007

Language:

english

File:

PDF, 171 KB

english, 2007

48

Novel tandem reaction of benzyne with cyclic ethers and active methines: synthesis of ω-trichloroalkyl phenyl ethers

Kentaro Okuma, Yuta Fukuzaki, Akiko Nojima, Kosei Shioji, Yoshinobu Yokomori

Journal:

Tetrahedron Letters

Year:

2008

Language:

english

File:

PDF, 179 KB

english, 2008

49

An efficient synthesis of (R)-(+)-recifeiolide and related macrolides by using enantiomerically pure (R)-(−)-5-methyl-2,2,2-triphenyl-1,2λ5-oxaphospholane

Kentaro Okuma, Syun-ichi Hirabayashi, Masaaki Ono, Kosei Shioji, Haruo Matsuyama, Hans J Bestmann

Journal:

Year:

1998

Language:

english

File:

PDF, 537 KB

english, 1998

50

Novel ring contraction of dioxepanes to tetrahydropyrans. Reaction of dioxepanes with trimethylsilyl trifluoromethanesulfonate

Kentaro Okuma, Tetsuji Hayano, Kosei Shioji, Haruo Matsuyama

Journal:

Tetrahedron Letters

Year:

2000

Language:

english

File:

PDF, 118 KB

english, 2000