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1

A protocol for visible light promoted desulfonylation reactions utilizing catalytic benzimidazolium aryloxide betaines and stoichiometric hydride donor reagents

Hasegawa, Eietsu, Tanaka, Tsukasa, Izumiya, Norihiro, Kiuchi, Takehiro, Ooe, Yuuki, Iwamoto, Hajime, Takizawa, Shin-ya, Murata, Shigeru

Journal:

Journal of Organic Chemistry

Year:

2020

Language:

english

File:

PDF, 618 KB

english, 2020

2

Pyrylium salt promoted substitution reactions of acetals with various silylated nucleophiles

Masaki Kamata, Satoshi Nagai, Mitsuaki Kato, Eietsu Hasegawa

Journal:

Tetrahedron Letters

Year:

1996

Language:

english

File:

PDF, 250 KB

english, 1996

3

Tris(trimethylsilyl)silane promoted radical reaction and electron-transfer reaction in benzotrifluoride

Eietsu Hasegawa, Yuki Ogawa, Koji Kakinuma, Hiroyuki Tsuchida, Emi Tosaka, Shinya Takizawa, Hiroyasu Muraoka, Tomoko Saikawa

Journal:

Year:

2008

Language:

english

File:

PDF, 311 KB

english, 2008

4

Contrastive Photoreduction Pathways of Benzophenones Governed by Regiospecific Deprotonation of Imidazoline Radical Cations and Additive Effects

Hasegawa, Eietsu, Seida, Takayuki, Chiba, Naoki, Takahashi, Tomoya, Ikeda, Hiroshi

Journal:

Journal of Organic Chemistry

Year:

2005

Language:

english

File:

PDF, 94 KB

english, 2005

5

ChemInform Abstract: A Photo-Reagent System of Benzimidazoline and Ru(bpy) 3 Cl 2 to Promote Hexenyl Radical Cyclization and Dowd-Beckwith Ring-Expansion of α-Halomethyl-Substituted Benzocyclic 1-Alkanones.

Hasegawa, Eietsu, Tateyama, Minami, Hoshi, Tsuneaki, Ohta, Taku, Tayama, Eiji, Iwamoto, Hajime, Takizawa, Shin-ya, Murata, Shigeru

Journal:

Year:

2014

File:

PDF, 28 KB

2014

6

Photoinduced electron-transfer systems consisting of electron-donating pyrenes or anthracenes and benzimidazolines for reductive transformation of carbonyl compounds

Eietsu Hasegawa, Shinya Takizawa, Takayuki Seida, Akira Yamaguchi, Naoto Yamaguchi, Naoki Chiba, Tomoya Takahashi, Hiroshi Ikeda, Kimio Akiyama

Journal:

Year:

2006

Language:

english

File:

PDF, 347 KB

english, 2006

7

The first example of samarium diiodide-promoted intramolecular ketone–ester coupling of ketones tethering acyloxyalkyl side chains producing 2-hydroxy cyclic hemiacetals

Eietsu Hasegawa, Kentaro Okamoto, Naoko Tanikawa, Momoe Nakamura, Kazuki Iwaya, Takashi Hoshi, Toshio Suzuki

Journal:

Tetrahedron Letters

Year:

2006

Language:

english

File:

PDF, 124 KB

english, 2006

8

Photoinduced single electron transfer reactions of 1,3-dithianes and 1,3-dithiolanes sensitized by triphenylpyrylium salt in the presence of molecular oxygen

Masaki Kamata, Yoshihiro Kato, Eietsu Hasegawa

Journal:

Tetrahedron Letters

Year:

1991

Language:

english

File:

PDF, 266 KB

english, 1991

9

Copper(II)–acid catalyzed cyclopropanation of 1,3-dienamides by electrophilic activation of α-aryl diazoesters

Tayama, Eiji, Horikawa, Kouki, Iwamoto, Hajime, Hasegawa, Eietsu

Journal:

Tetrahedron Letters

Year:

2014

Language:

english

File:

PDF, 313 KB

english, 2014

10

Electron Transfer Promoted Regioselective Ring-Opening Reaction of Cyclopropyl Silyl Ethers †

Hasegawa, Eietsu, Yamaguchi, Naoto, Muraoka, Hiroyasu, Tsuchida, Hiroyuki

Journal:

Organic Letters

Year:

2007

Language:

english

File:

PDF, 97 KB

english, 2007

11

Photoreaction of halomethyl substituted benzocyclic ketones with amines: radical cyclization and ring expansion reactions promoted through photoinduced electron transfer processes

Hasegawa, Eietsu

Journal:

Chemical Communications

Year:

1997

Language:

english

File:

PDF, 47 KB

english, 1997

12

Remarkable enhancement effect of potassium tert-butoxide/THF solution in base-induced Sommelet–Hauser rearrangements

Eiji Tayama, Keisuke Takedachi, Hajime Iwamoto, Eietsu Hasegawa

Journal:

Year:

2010

Language:

english

File:

PDF, 364 KB

english, 2010

13

Pyrylium salt sensitized photochemical deprotections of dithioacetals and ketals

Masaki Kamata, Yukiko Murakami, Yasuko Tamagawa, Mitsuaki Kato, Eietsu Hasegawa

Journal:

Year:

1994

Language:

english

File:

PDF, 431 KB

english, 1994

14

Asymmetric α-2-tosylethenylation of N,N-dialkyl-l-amino acid esters via the formation of non-racemic ammonium enolates

Tayama, Eiji, Igarashi, Tomohito, Iwamoto, Hajime, Hasegawa, Eietsu

Journal:

Organic & Biomolecular Chemistry

Year:

2011

Language:

english

File:

PDF, 250 KB

english, 2011

15

Visible Light-Promoted Metal-Free Reduction of Organohalides by 2-Naphthyl or 2-Hydroxynaphthyl-Substituted 1,3-Dimethylbenzimidazolines

Hasegawa, Eietsu, Mori, Kazuma, Tsuji, Shiori, Nemoto, Kazuki, Ohta, Taku, Iwamoto, Hajime

Journal:

Australian Journal of Chemistry

Year:

2015

Language:

english

File:

PDF, 449 KB

english, 2015

16

Cycloreversion Reaction of Cage Compounds Initiated by Aminium Cation Radical Salts

Hasegawa, Eietsu, Mukai, Toshio

Journal:

Bulletin of the Chemical Society of Japan

Year:

1985

File:

PDF, 386 KB

1985

17

PHOTOSENSITIZED CARBON–OXYGEN BOND CLEAVAGE REACTION OF EPOXIDES BY 2,4,6-TRIPHENYLPYRYLIUM TETRAFLUOROBORATE SALT

Okada, Keiji, Hasegawa, Eietsu, Mukai, Toshio

Journal:

Chemistry Letters

Year:

1983

Language:

english

File:

PDF, 7.22 MB

english, 1983

18

Visible light-promoted reductive transformations of various organic substances by using hydroxyaryl-substituted benzimidazolines and bases

Hasegawa, Eietsu, Izumiya, Norihiro, Fukuda, Takuya, Nemoto, Kazuki, Iwamoto, Hajime, Takizawa, Shin-ya, Murata, Shigeru

Journal:

Year:

2016

Language:

english

File:

PDF, 1011 KB

english, 2016

19

The Rearrangement of .ALPHA.-(Phenoxy)phenylacetic Acids and Benzyl phenyl Ethers with Polyphosphoric Acid.

HANAYA, Kaoru, MURAMATSU, Takashi, IZAWA, Osamu, YOKOUCHI, Akira, HASEGAWA, Eietsu

Journal:

NIPPON KAGAKU KAISHI

Year:

1993

File:

PDF, 1.50 MB

1993

20

Deprotection of 1,3-dithianes by antimony pentachloride via single electron transfer processes

Masaki Kamata, Hisashi Otogawa, Eietsu Hasegawa

Journal:

Tetrahedron Letters

Year:

1991

Language:

english

File:

PDF, 164 KB

english, 1991

21

Rate constants for the reactions of primary alkyl radicals with SmI2 in THF/HMPA

Eietsu Hasegawa, Dennis P. Curran

Journal:

Tetrahedron Letters

Year:

1993

Language:

english

File:

PDF, 361 KB

english, 1993

22

Furan derivatives. Part 10. Synthesis of cyclohepta[cd]benzofuran

Takaaki Horaguchi, Eietsu Hasegawa, Takahachi Shimizu, Kiyoshi Tanemura, Tsuneo Suzuki

Journal:

Journal of Heterocyclic Chemistry

Year:

1989

File:

PDF, 462 KB

1989

23

Frameshift Mutagenicity and DNA Intercalation of 9-Amino-2-hydroxyacridine, a Rat Liver S9 Metabolite of 9-Aminoacridine

Tomosaka, Hideyuki, Anzai, Kentaro, Hasegawa, Eietsu, Horigome, Tsuneyoshi, Omata, Saburo

Journal:

Bioscience Biotechnology and Biochemistry

Year:

1996

Language:

english

File:

PDF, 516 KB

english, 1996

24

Benzimidazolium naphthoxide betaine is a visible light promoted organic photo-redox catalyst

Hasegawa, Eietsu, Izumiya, Norihiro, Miura, Tomoaki, Ikoma, Tadaaki, Iwamoto, Hajime, Takizawa, Shin-ya, Murata, Shigeru

Journal:

Journal of Organic Chemistry

Year:

2018

Language:

english

File:

PDF, 676 KB

english, 2018

25

Photoinduced electron transfer reactions of α,β-epoxy ketones with 2-phenyl-N,N-dimethylbenzimidazoline (PDMBI): Significant water effect on the reaction pathway

Eietsu Hasegawa, Teru Kato, Takashi Kitazume, Kazuhiro Yanagi, Kazuya Hasegawa, Takaaki Horaguchi

Journal:

Tetrahedron Letters

Year:

1996

Language:

english

File:

PDF, 232 KB

english, 1996

26

Reductive transformation of α,β-epoxy ketones and other compounds promoted through photoinduced electron transfer processes with 1,3-dimethyl-2-phenylbenzimidazoline (DMPBI)

Eietsu Hasegawa, Akira Yoneoka, Kumiko Suzuki, Teru Kato, Takashi Kitazume, Kazuhiro Yanagi

Journal:

Year:

1999

Language:

english

File:

PDF, 596 KB

english, 1999

27

Furan derivatives. part 11 [1]. on substituent effects in the synthesis of 3,4,5,6-tetrahydrocyclohepta[cd]benzofurans

Takaaki Horaguchi, Hiroto Kobayashi, Kazuhiro Miyazawa, Eietsu Hasegawa, Takahachi Shimizu, Tsuneo Suzuki, Kiyoshi Tanemura

Journal:

Journal of Heterocyclic Chemistry

Year:

1990

File:

PDF, 478 KB

1990

28

Novel electron-transfer photocyclization reactions of .alpha.-silyl amine .alpha.,.beta.-unsaturated ketone and ester systems

Xu, Wei, Jeon, Yoon T., Hasegawa, Eietsu, Yoon, Ung C., Mariano, Patrick S.

Journal:

Journal of the American Chemical Society

Year:

1989

Language:

english

File:

PDF, 373 KB

english, 1989

29

Furan derivatives. Part 12 . Synthesis of 2,5-dioxacyclohepta[jkl]-as-indacenes

Takaaki Horaguchi, Kazuhiro Miyazawa, Eietsu Hasegawa, Takahachi Shimizu, Tsuneo Suzuki, Kiyoshi Tanemura

Journal:

Journal of Heterocyclic Chemistry

Year:

1990

File:

PDF, 578 KB

1990

30

ChemInform Abstract: Copper(II)-Acid-Cocatalyzed Intermolecular Substitution of Electron-Rich Aromatics with Diazoesters.

Tayama, Eiji, Ishikawa, Moe, Iwamoto, Hajime, Hasegawa, Eietsu

Journal:

Year:

2013

File:

PDF, 31 KB

2013

31

Photoinduced electron-transfer reactions of 1-substituted 2,3-diphenylaziridines with 9,10-dicyanoanthracene and chloranil

Hasegawa, Eietsu, Koshii, Satoshi, Horaguchi, Takaaki, Shimizu, Takahachi

Journal:

Journal of Organic Chemistry

Year:

1992

Language:

english

File:

PDF, 411 KB

english, 1992

32

Photosensitized [2+2] cycloreversion reactions of arylated cage compounds in nonpolar solvents. Highly efficient adiabatic exciplex isomerization

Hasegawa, Eietsu, Okada, Keiji, Ikeda, Hiroshi, Yamashita, Yoshiro, Mukai, Toshio

Journal:

Journal of Organic Chemistry

Year:

1991

Language:

english

File:

PDF, 1.16 MB

english, 1991

33

Metal-Free, One-Pot, Sequential Protocol for Transforming α,β-Epoxy Ketones to β-Hydroxy Ketones and α-Methylene Ketones

Hasegawa, Eietsu, Arai, Saki, Tayama, Eiji, Iwamoto, Hajime

Journal:

Journal of Organic Chemistry

Year:

2015

Language:

english

File:

PDF, 668 KB

english, 2015

34

Electron transfer induced stereoselective cyclization of 2,2-disubstituted dibenzoylmethane to anti-1,2-cyclopropanediol

Eietsu Hasegawa, Hideyuki Katagi, Daisuke Nakagawa, Takaaki Horaguchi, Shyoji Tanaka, Yoshiro Yamashita

Journal:

Tetrahedron Letters

Year:

1995

Language:

english

File:

PDF, 251 KB

english, 1995

35

Free radical trapping of α-keto radicals derived from α,β-epoxy ketones via photoinduced single electron transfer process

Eietsu Hasegawa, Kenyuki Ishiyama, Takaaki Horaguchi, Takahachi Shimizu

Journal:

Tetrahedron Letters

Year:

1991

Language:

english

File:

PDF, 240 KB

english, 1991

36

ChemInform Abstract: 1,2-Dimethoxy-4,5-dimethylene: A New Protecting Group for Acyclic Amino Acid Derivatives Prepared by Stevens Rearrangement.

Eiji Tayama, Keisuke Takedachi, Hajime Iwamoto, Eietsu Hasegawa

Journal:

Year:

2012

File:

PDF, 61 KB

2012

37

Photocyclization reactions. Part 4 . Synthesis of naphtho[1,8-bc]-furans and cyclohepta[cd]benzofurans using photocyclization of Ethyl 2-(8-Oxo-5,6,7,8-tetrahydro-1-naphthyloxy)acetates and ethyl 2-(5-Oxo-6,7,8,9-tetrahydro-5H-benzocyclohepten-4-yloxy)acetates

Essam Mohamed Sharshira, Haruki Iwanami, Mutsuo Okamura, Eietsu Hasegawa, Takaaki Horaguchi

Journal:

Journal of Heterocyclic Chemistry

Year:

1996

File:

PDF, 680 KB

1996

38

Exploratory study on photoinduced single electron transfer reactions of .alpha.,.beta.-epoxy ketones with amines [Erratum to document cited in CA114(15):142987y]

Hasegawa, Eietsu, Ishiyama, Kenyuki, Horaguchi, Takaaki, Shimizu, Takahachi

Journal:

Journal of Organic Chemistry

Year:

1991

Language:

english

File:

PDF, 126 KB

english, 1991

39

An Effective Procedure to Promote Aza–Prins Cyclization Reactions Employing a Combination of Ferric Chloride and an Imidazolium Salt in Benzotrifluoride

Hasegawa, Eietsu, Osawa, Chika, Tateyama, Minami, Miura, Kensuke, Tayama, Eiji, Iwamoto, Hajime

Journal:

Year:

2012

Language:

english

File:

PDF, 1.07 MB

english, 2012

40

ChemInform Abstract: Double Axial Chirality Promoted Asymmetric [2,3] Stevens Rearrangement of N-Cinnamyl L-Alanine Amide-Derived Ammonium Ylides.

Tayama, Eiji, Naganuma, Noriko, Iwamoto, Hajime, Hasegawa, Eietsu

Journal:

Year:

2014

File:

PDF, 21 KB

2014

41

ChemInform Abstract: Metal-Free, One-Pot, Sequential Protocol for Transforming α,β-Epoxy Ketones to β-Hydroxy Ketones and α-Methylene Ketones.

Hasegawa, Eietsu, Arai, Saki, Tayama, Eiji, Iwamoto, Hajime

Journal:

Year:

2015

File:

PDF, 28 KB

2015

42

Novel biphasic reaction system of ferric chloride dissolved imidazolium hexafluorophosphate and benzotrifluoride: application to electron transfer reaction of cyclopropyl silyl ethers

Hiroyuki Tsuchida, Eietsu Hasegawa

Journal:

Year:

2010

Language:

english

File:

PDF, 330 KB

english, 2010

43

Samarium diiodide-promoted intramolecular ketone–ester coupling reaction: novel cyclization and ring expansion pathway

Kazuki Iwaya, Momoe Nakamura, Eietsu Hasegawa

Journal:

Tetrahedron Letters

Year:

2002

Language:

english

File:

PDF, 76 KB

english, 2002

44

Conformational effects in photocyclization of six and seven-membered ring alkoxyketones

Horaguchi, Takaaki, Iwanami, Haruki, Tanaka, Takakazu, Hasegawa, Eietsu, Shimizu, Takahachi

Journal:

Journal of the Chemical Society Chemical Communications

Year:

1991

Language:

english

File:

PDF, 347 KB

english, 1991

45

Electron-transfer-induced photoadditions of the silyl amine, Et2NCH2SiMe3, to .alpha.,.beta.-unsaturated cyclohexenones. Dual reaction pathways based on ion pair-selective cation-radical chemistry

Hasegawa, Eietsu., Xu, Wei., Mariano, Patrick S., Yoon, Ung Chan., Kim, Jin Uk.

Journal:

Journal of the American Chemical Society

Year:

1988

Language:

english

File:

PDF, 1.74 MB

english, 1988

46

Changeable reactivity of ketyl radicals derived from 2-bromomethyl-2-(3-butenyl)benzocyclic-1-alkanones depending on electron transfer conditions employed

Hasegawa, Eietsu, Takizawa, Shinya, Iwaya, Kazuki, Kurokawa, Miyuki, Chiba, Naoki, Yamamichi, Keiko

Journal:

Chemical Communications

Year:

2002

Language:

english

File:

PDF, 115 KB

english, 2002

47

Photocyclization reactions. Part 6. Solvent and substituent effects in the synthesis of dihydrobenzofuranols using photocyclization of 2-alkoxybenzophenones and ethyl 2-benzoylphenoxyacetates

Essam Mohamed Sharshira, Mutsuo Okamura, Eietsu Hasegawa, Takaaki Horaguchi

Journal:

Journal of Heterocyclic Chemistry

Year:

1997

File:

PDF, 622 KB

1997

48

ChemInform Abstract: Asymmetric α-2-Tosylethenylation of N,N-Dialkyl-L-amino Acid Esters via the Formation of Non-Racemic Ammonium Enolates.

Eiji Tayama, Tomohito Igarashi, Hajime Iwamoto, Eietsu Hasegawa

Journal:

Year:

2012

File:

PDF, 36 KB

2012

49

Selective Synthesis of [2]- and [3]Catenane Tuned by Ring Size and Concentration

Iwamoto, Hajime, Takizawa, Wataru, Itoh, Koji, Hagiwara, Tatsuya, Tayama, Eiji, Hasegawa, Eietsu, Haino, Takeharu

Journal:

Journal of Organic Chemistry

Year:

2013

Language:

english

File:

PDF, 1.66 MB

english, 2013

50

Electron-Transfer Reactions of Aromatic α,β-Epoxy Ketones: Factors That Govern Selective Conversion to β-Diketones and β-Hydroxy Ketones

Hasegawa, Eietsu, Ishiyama, Kenyuki, Fujita, Takayuki, Kato, Tomoyasu, Abe, Toshiaki

Journal:

Journal of Organic Chemistry

Year:

1997

Language:

english

File:

PDF, 186 KB

english, 1997

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