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1

ChemInform Abstract: Synthesis and Biological Activity of 1,5-Dihydropyridazino[3,4-b]quinoxalines and a New Class of Quinolones

Yoshihisa Kurasawa, Ho Sik Kim

Journal:

Year:

1999

File:

PDF, 26 KB

1999

2

ChemInform Abstract: A Convenient Synthesis of 2-Amino-4H-1,3,4-oxadiazino[5,6-b]quinoxaline Derivatives.

Ho Sik Kim, Tong Eun Kim, Seong Uk Lee, Dong Il Kim, Sung Wook Han, Yoshihisa Okamoto, Takako Mitomi, Yoshihisa Kurasawa

Journal:

Year:

1999

File:

PDF, 33 KB

1999

3

ChemInform Abstract: Synthesis of 1,3,4-Thiadiazines and 1,3,4-Oxadiazines

Ho Sik Kim, Yoshihisa Kurasawa

Journal:

Year:

1999

File:

PDF, 24 KB

1999

4

ChemInform Abstract: Synthesis of Pyrazoles and Condensed Pyrazoles

Kenzi Makino, Ho Sik Kim, Yoshihisa Kurasawa

Journal:

Year:

1999

File:

PDF, 24 KB

1999

5

ChemInform Abstract: Ring Closure of 4-Substituted 1-Amino-1-(2-aminoanilino)-2,4-dicyanobuta-1,3-diene via 5-exo-trig and 6-exo-dig Process.

Yoshimi Yamaguchi, Kaname Takagi, Yoshihisa Okamoto, Kazuho Harada, Yoshihisa Kurasawa

Journal:

Year:

1999

File:

PDF, 30 KB

1999

6

ChemInform Abstract: Synthesis and Conversion of 2-(Pyrazol-1-yl)quinoxaline 4-Oxides.

Ho Sik Kim, Sam Tag Kwag, Kyung Ok Choi, Yoshihisa Okamoto, Shinnosuke Kajiwara, Noriko Fujiwara, Yoshihisa Kurasawa

Journal:

Year:

2000

File:

PDF, 31 KB

2000

7

ChemInform Abstract: Quinolone Analogues. Part I. A Convenient Synthesis of 1-Alkyl-4-oxo-1,4-dihydropyridazino[3,4-b]quinoxaline-3-carboxylic Acids.

Yoshihisa Kurasawa, Akiko Tsuruoka, Nanae Rikiishi, Noriko Fujiwara, Yoshihisa Okamoto, Ho Sik Kim

Journal:

Year:

2001

File:

PDF, 31 KB

2001

8

ChemInform Abstract: Quinolone Analogues. Part 2. A Facile Synthesis of Novel 3-Substituted 1-Alkyl-4-oxo-1,4-dihydropyridazino[3,4-b]quinoxalines.

Yoshihisa Kurasawa, Kazunori Sakurai, Shinnosuke Kajiwara, Kazuho Harada, Yoshihisa Okamoto, Ho Sik Kim

Journal:

Year:

2001

File:

PDF, 33 KB

2001

9

ChemInform Abstract: Synthesis of Novel 3-(2-Thienyl)-1,2-diazepino[3,4-b]quinoxalines with Algicidal Activity.

Ho Sik Kim, Geuk Jeong, Hyoung Choul Lee, Jin Hee Kim, Yong Tae Park, Yoshihisa Okamoto, Shinnosuke Kajiwara, Yoshihisa Kurasawa

Journal:

Year:

2001

File:

PDF, 31 KB

2001

10

ChemInform Abstract: Quinolone Analogues. Part 4. Synthesis of 1-Methyl-3-trifluoromethylpyridazino[3,4-b]quinoxalin-4(1H)-ones.

Yoshihisa Kurasawa, Izumi Matsuzaki, Waka Satoh, Yoshihisa Okamoto, Ho Sik Kim

Journal:

Year:

2002

File:

PDF, 31 KB

2002

11

ChemInform Abstract: Synthesis of 1,2-Diazepino[3,4-b]quinoxalines by 1,3-Dipolar Cycloaddition Reaction and Their Ring Transformation to Pyridazino[3,4-b]quinoxalines.

Ho Sik Kim, Seong Uk Lee, Hyoung Choul Lee, Yoshihisa Kurasawa

Journal:

Year:

2002

File:

PDF, 30 KB

2002

12

ChemInform Abstract: Synthesis and Biological Activities of Quinolone Analogues: Pyridazino[3,4-b]quinoxalin-4-ones.

Yoshihisa Kurasawa, Ho Sik Kim

Journal:

Year:

2002

File:

PDF, 26 KB

2002

13

Quinolone Analogues. Part 6. Synthesis of 3-Halogeno-1-methylpyridazino[3,4-b]quinoxalin-4(1H)-ones.

Yoshihisa Kurasawa, Waka Satoh, Izumi Matsuzaki, Yuka Maesaki, Yoshihisa Okamoto, Ho Sik Kim

Journal:

Year:

2004

File:

PDF, 140 KB

2004

14

Quinolone Analogues. Part 7. Synthesis of 3-Heteroaryl-1-methylpyridazino[3,4-b]quinoxalin-4(1H)-ones.

Yoshihisa Kurasawa, Eisuke Kaji, Yoshihisa Okamoto, Ho Sik Kim

Journal:

Year:

2005

File:

PDF, 23 KB

2005

15

Synthesis of Biologically Active Pyridazinoquinoxalines

Yoshihisa Kurasawa, Ho Sik Kim

Journal:

Year:

2005

File:

PDF, 8 KB

2005

16

Quinolone Analogues. Part 8. Synthesis of 3-Aminopyridazino[3,4-b]quinoxalin-4(1H)-one.

Yoshihisa Kurasawa, Ayaka Kawase, Jun Takizawa, Yuka Maesaki, Eisuke Kaji, Yoshihisa Okamoto, Ho Sik Kim

Journal:

Year:

2005

File:

PDF, 23 KB

2005

17

ChemInform Abstract: Quinolone Analogues. Part 10. Synthesis of Antimalarial Quinolones Having Pyridyl Moiety in N1-Side Chain.

Yoshihisa Kurasawa, Kiminari Yoshida, Naoki Yamazaki, Eisuke Kaji, Kenji Sasaki, Yoshiko Hiwasa, Akiko Tsukamoto, Hideyuki Ito

Journal:

Year:

2010

File:

PDF, 35 KB

2010

18

Quinolone analogues 10: Synthesis of antimalarial quinolones having pyridyl moiety in N1-side chain

Yoshihisa Kurasawa, Kiminari Yoshida, Naoki Yamazaki, Eisuke Kaji, Kenji Sasaki, Yoshiko Hiwasa, Akiko Tsukamoto, Hideyuki Ito

Journal:

Journal of Heterocyclic Chemistry

Year:

2010

Language:

english

File:

PDF, 289 KB

english, 2010

19

Synthesis of novel pyridazino[3,4-b]quinoxalines

Ho Sik Kim, Eun Kyoung Kim, Sung Sik Kim, Yong Tae Park, Young Seuk Hong, Yoshihisa Kurasawa

Journal:

Journal of Heterocyclic Chemistry

Year:

1997

File:

PDF, 225 KB

1997

20

13C-NMR study on the tautomerism of 3-(arylhydrazono)methyl-2-oxo-1,2-dihydroquinoxalines between the hydrazone imine and diazenylenamine forms

Yoshihisa Kurasawa, Akiko Takano, Kyoko Kato, Ho Sik Kim, Yoshihisa Okamoto

Journal:

Journal of Heterocyclic Chemistry

Year:

1997

File:

PDF, 232 KB

1997

21

13C-NMR study of 4H-1,3,4-thiadiazino[5,6-b]quinoxalines. A proof for the N5-deuteration in deuteriotrifluoroacetic acid

Ho Sik Kim, Yoshihisa Okamoto, Yoshihisa Kurasawa

Journal:

Journal of Heterocyclic Chemistry

Year:

1997

File:

PDF, 202 KB

1997

22

A selective synthesis of 2-arylamino-4H-1,3,4-thiadiazino[5,6-b]-quinoxalines and mesoionic triazolo[4,3-a]quinoxaline

Ho Sik Kim, Tong Eun Kim, Sam Tag Kwag, Yong Tae Park, Young Seuk Hong, Yoshihisa Okamoto, Yoshihisa Kurasawa

Journal:

Journal of Heterocyclic Chemistry

Year:

1997

File:

PDF, 277 KB

1997

23

Synthesis of 4H-1,3,4-oxadiazino[5,6-b]quinoxalines from 2-substituted quinoxaline 4-oxides

Ho Sik Kim, Eun Ah Kim, Geuk Jeong, Yong Tae Park, Young Seuk Hong, Yoshihisa Okamoto, Yoshihisa Kurasawa

Journal:

Journal of Heterocyclic Chemistry

Year:

1998

File:

PDF, 308 KB

1998

24

Synthesis of pyrazoles

Kenzi Makino, Ho Sik Kim, Yoshihisa Kurasawa

Journal:

Journal of Heterocyclic Chemistry

Year:

1998

File:

PDF, 454 KB

1998

25

Synthesis and biological activity of 1,5-dihydropyridazino-[3,4-b]quinoxalines and a new class of quinolones

Yoshihisa Kurasawa, Ho Sik Kim

Journal:

Journal of Heterocyclic Chemistry

Year:

1998

File:

PDF, 374 KB

1998

26

A new tautomeric zwitterion form of 2-acylamino-4H-1,3,4-oxadiazino[5,6-b]quinoxalines in solution

Yoshihisa Kurasawa, Takako Mitomi, Yoshihisa Okamoto, Ho Sik Kim

Journal:

Journal of Heterocyclic Chemistry

Year:

1998

File:

PDF, 323 KB

1998

27

A convenient synthesis of 2-amino-4H-1,3,4-oxadiazino[5,6-b]-quinoxaline derivatives

Ho Sik Kim, Tong Eun Kim, Seong Uk Lee, Dong Il Kim, Sung Wook Han, Yoshihisa Okamoto, Takako Mitomi, Yoshihisa Kurasawa

Journal:

Journal of Heterocyclic Chemistry

Year:

1998

File:

PDF, 380 KB

1998

28

Synthesis of pyrazoles and condensed pyrazoles

Kenzi Makino, Ho Sik Kim, Yoshihisa Kurasawa

Journal:

Journal of Heterocyclic Chemistry

Year:

1999

File:

PDF, 618 KB

1999

29

Synthesis and conversion of 2-(pyrazol-1-yl)quinoxaline 4-oxides

Ho Sik Kim, Sam Tag Kwag, Kyung Ok Choi, Yoshihisa Okamoto, Shinnosuke Kajiwara, Noriko Fujiwara, Yoshihisa Kurasawa

Journal:

Journal of Heterocyclic Chemistry

Year:

2000

File:

PDF, 339 KB

2000

30

Quinolone analogues 1. A convenient synthesis of 1-alkyl-4-oxo-1,4-dihydropyridazino[3,4-b]quinoxaline-3-carboxylic acids

Yoshihisa Kurasawa, Akiko Tsuruoka, Nanae Rikiishi, Noriko Fujiwara, Yoshihisa Okamoto, Ho Sik Kim

Journal:

Journal of Heterocyclic Chemistry

Year:

2000

File:

PDF, 523 KB

2000

31

Quinolone analogues 2. A facile synthesis of novel 3-substituted 1-alkyl-4-oxo-1,4-dihydropyridazino[3,4-b]quinoxalines

Yoshihisa Kurasawa, Kazunori Sakurai, Shinnosuke Kajiwara, Kazuho Harada, Yoshihisa Okamoto, Ho Sik Kim

Journal:

Journal of Heterocyclic Chemistry

Year:

2000

File:

PDF, 471 KB

2000

32

Synthesiss of novel 3-(2-thienyl)-1,2-diazepino[3,4-b]quinoxalines with algicidal activity

Ho Sik Kim, Geuk Jeong, Hyoung Choul Lee, Jin Hee Kim, Yong Tae Park, Yoshihisa Okamoto, Shinnosuke Kajiwara, Yoshihisa Kurasawa

Journal:

Journal of Heterocyclic Chemistry

Year:

2000

File:

PDF, 267 KB

2000

33

Synthesis and biological activities of quinolone analogues: Pyridazino[3,4-b]quinoxalin-4-one

Yoshihisa Kurasawa, Ho Sik Kim

Journal:

Journal of Heterocyclic Chemistry

Year:

2002

Language:

english

File:

PDF, 445 KB

english, 2002

34

Quinolone analogues 6 [1-5]. Synthesis of 3-halogeno-1-methylpyridazino[3,4-b]quinoxalin-4(1H)-ones

Yoshihisa Kurasawa, Waka Satoh, Izumi Matsuzaki, Yuka Maesaki, Yoshihisa Okamoto, Ho Sik Kim

Journal:

Journal of Heterocyclic Chemistry

Year:

2003

Language:

english

File:

PDF, 126 KB

english, 2003

35

Quinolone analogues 7 [1-6]. Synthesis of 3-Heteroaryl-1-methylpyridazino[3,4-b]quinoxalin-4(1H)-ones

Yoshihisa Kurasawa, Eisuke Kaji, Yoshihisa Okamoto, Ho Sik Kim

Journal:

Journal of Heterocyclic Chemistry

Year:

2005

Language:

english

File:

PDF, 196 KB

english, 2005

36

Synthesis of biologically active pyridazinoquinoxalines

Yoshihisa Kurasawa, Ho Sik Kim

Journal:

Journal of Heterocyclic Chemistry

Year:

2005

Language:

english

File:

PDF, 251 KB

english, 2005

37

Quinolone analogues 8 [1-6]. Synthesis of 3-aminopyridazino-[3,4-b]quinoxalin-4(lH)-one

Yoshihisa Kurasawa, Ayaka Kawase, Jun Takizawa, Yuka Maesaki, Eisuke Kaji, Yoshihisa Okamoto, Ho Sik Kim

Journal:

Journal of Heterocyclic Chemistry

Year:

2005

Language:

english

File:

PDF, 145 KB

english, 2005

38

Quinolone analogues 9. Synthesis of 7-methylsulfanyl- and 7-methanesulfonylpyridazino[3,4-b]quinoxalin-4(1H)-ones

Yoshihisa Kurasawa, Masami Nakamura, Hiroaki Ashida, Mitsunori Masuda, Eisuke Kaji, Yoshihisa Okamoto, Ho Sik Kim

Journal:

Journal of Heterocyclic Chemistry

Year:

2007

Language:

english

File:

PDF, 413 KB

english, 2007

39

Electrophilic aromatic substitution of 3-alkoxy-6-alkyl-2-cyano-4,5,6a,11-tetraazabenzo[a]fluorene with orthoesters

Yoshihisa Okamoto, Yoshimi Yamaguchi, Mitsuaki Maeda, Yoshihisa Kurasawa

Journal:

Journal of Heterocyclic Chemistry

Year:

2008

Language:

english

File:

PDF, 328 KB

english, 2008

40

Tautomeric structure of dihiydropyridazino-[3,4-b]quinoxalines in solution and solid state

Yoshihisa Kurasawa, Akiko Takano, Kazuho Harada, Atsushi Takada, Ho Sik Kim, Yoshihisa Okamoto

Journal:

Chemistry of Heterocyclic Compounds

Year:

1995

Language:

english

File:

PDF, 526 KB

english, 1995

41

Facile synthesis of novel 3-quinoxalinyl-1,5-benzodiazepines via ring transformation. Stable tautomers in the 1,5-benzodiazepin-2-one ring system

Yoshihisa Kurasawa, Yoshihisa Okamoto, Kuniyoshi Ogura, Atsushi Takada

Journal:

Journal of Heterocyclic Chemistry

Year:

1985

File:

PDF, 276 KB

1985

42

A new method for the synthesis of novel 1,2,4-triazolo[3,4-f][1,2,4]triazines

Yoshihisa Kurasawa, Yoshihisa Okamoto, Atsushi Takada

Journal:

Journal of Heterocyclic Chemistry

Year:

1985

File:

PDF, 87 KB

1985

43

Synthesis of novel 3-substituted 1,5-benzodiazepine derivatives

Yoshihisa Kurasawa, Sayuri Shimabukuro, Yoshihisa Okamoto, Kuniyoshi Ogura, Atsushi Takada

Journal:

Journal of Heterocyclic Chemistry

Year:

1985

File:

PDF, 154 KB

1985

44

Synthesis of novel quinoxalines by ring transformation of 3-quinoxalinyl-l,5-benzodiazepine

Yoshihisa Kurasawa, Sayuri Shimabukuro, Yoshihisa Okamoto, Atsushi Takada

Journal:

Journal of Heterocyclic Chemistry

Year:

1985

File:

PDF, 259 KB

1985

45

Synthesis and conversions of 3-(4-amino-5-methyl-4H-1,2,4-triazol-3-ylmethylene)-2-oxo-1,2,3,4-tetrahydroquinoxaline

Yoshihisa Kurasawa, Yoshihisa Okamoto, Atsushi Takada

Journal:

Journal of Heterocyclic Chemistry

Year:

1985

File:

PDF, 279 KB

1985

46

A new method for the synthesis of novel 1-aryl-3-quinoxalinyl-1,2,4-triazol-5-ones

Yoshihisa Kurasawa, Muneto Muramatsu, Keizo Hotehama, Yoshihisa Okamoto, Atsushi Takada

Journal:

Journal of Heterocyclic Chemistry

Year:

1985

File:

PDF, 137 KB

1985

47

Synthesis and degradation of 3-amino-3-(2-substituted benzimidazol-1-yl)-2-(2-phenyl-1,1-diazanediylmethyl)-2-propenenitrile: Hydroxyl group-promoted CN bond fission

Yoshihisa Okamoto, Yoshihisa Kurasawa, Atsushi Takada, Kaname Takagi

Journal:

Journal of Heterocyclic Chemistry

Year:

1985

File:

PDF, 150 KB

1985

48

A facile synthesis of novel 1-aryl-1H-pyrazolo[3,4-b]quinoxalines

Yoshihisa Kurasawa, Kaoru Yamazaki, Setsuko Tajima, Yoshihisa Okamoto, Atsushi Takada

Journal:

Journal of Heterocyclic Chemistry

Year:

1986

Language:

english

File:

PDF, 140 KB

english, 1986

49

A new synthesis of novel 1-aryl-3-heteroaryl-1H-pyrazolo[3,4-b]quinoxalines via a Key Intermediate

Yoshihisa Kurasawa, Muneto Muramatsu, Kaoru Yamazaki, Setsuko Tajima, Yoshihisa Okamoto, Atsushi Takada

Journal:

Journal of Heterocyclic Chemistry

Year:

1986

Language:

english

File:

PDF, 206 KB

english, 1986

50

Synthesis of novel 3-(α-arylhydrazono-1,3,4-oxadiazol-2-ylmethyl)-2-oxo-1,2-dihydroquinoxalines and their characteristic tautomerism between the hydrazone imine and diazenyl enamine forms

Yoshihisa Kurasawa, Muneto Muramatsu, Yoshihisa Okamoto, Atsushi Takada

Journal:

Journal of Heterocyclic Chemistry

Year:

1986

Language:

english

File:

PDF, 223 KB

english, 1986