Y. Kurasawa

发表

Progress in the chemistry of quinoxaline N‐oxides and N,N′‐dioxides

A. Takada, Y. Kurasawa, Ho Sik Kim, 1995 .

Synthesis of pyrazoles and condensed pyrazoles

Y. Kurasawa, Ho Sik Kim, K. Makino, 1999 .

Synthesis of pyrazoles

Y. Kurasawa, Ho Sik Kim, K. Makino, 1998 .

Synthesis, Biological Activities, and Tautomerism of 4-Quinolones and Related Compounds

K. Sasaki, Y. Kurasawa, 2015 .

Preparation and Ring Conversion of Furo [2, 3-b] quinoxaline

A. Takada, Y. Kurasawa, 1981 .

A new type of deoxygenation of quinoxaline N‐oxides

Y. Okamoto, A. Takada, Y. Kurasawa, 1992 .

Synthesis of isoxazolo[2,3‐a]quinoxalines and pyrrolo[1,2‐a]quinoxalines by 1,3‐dipolar cycloaddition reaction

Y. Okamoto, A. Takada, Y. Kurasawa, 1990 .

Quinolone Analogs 13: Synthesis of Novel 1,1′‐(2‐Methylenepropane‐1,3‐diyl)di(4‐quinolone‐3‐carboxylate) and Related Compounds

Hideyuki Ito, E. Kaji, K. Sasaki, 2014 .

Quinolone Analogs 16: A Facile D–H Exchange for 3-H Proton of 2-Substituted 4-Quinolones in Acidic Media

Hideyuki Ito, E. Kaji, K. Sasaki, 2014 .

Quinolone Analogues 15: Synthesis and Antimalarial Activity of 4-Phenyl-1-(1-triazolylmethyl-4-quinolon-3-ylcarbonyl)semicarbazide and Related Compounds

Hideyuki Ito, E. Kaji, K. Sasaki, 2014 .

Quinolone Analogs 14: Synthesis of Antimalarial 1-Aryl-3-(4-quinolon-2-yl)ureas and Related Compounds

Hideyuki Ito, E. Kaji, K. Sasaki, 2014 .

Quinolone Analogues 12: Synthesis and Tautomers of 2‐Substituted 4‐Quinolones and Related Compounds

E. Kaji, K. Sasaki, N. Yamazaki, 2012 .

Quinolone analogs 11: Synthesis of novel 4‐quinolone‐3‐carbohydrazide derivatives with antimalarial activity

Hideyuki Ito, E. Kaji, K. Sasaki, 2012 .

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

Y. Okamoto, E. Kaji, Y. Kurasawa, 2005 .

Synthesis of Biologically Active Pyridazinoquinoxalines

Y. Kurasawa, Ho Sik Kim, H. Kim, 2005 .

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

Y. Okamoto, E. Kaji, Y. Kurasawa, 2005 .

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

Y. Okamoto, Y. Kurasawa, Ho Sik Kim, 2003 .

Quinolone Analogues 5. Synthesis of 1-Methylpyridazino[3,4-b]quinoxalin-4(1H)-ones

Y. Okamoto, Y. Kurasawa, Ho Sik Kim, 2002 .

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

Y. Kurasawa, Ho Sik Kim, H. Kim, 2002 .

Qinolone Analogues 4. Synthesis ofÅ@1-Methyl-3-trifluoromethylpyridazino[3,4-b]quinoxalin-4(1H)-ones

Y. Okamoto, Y. Kurasawa, Ho Sik Kim, 2002 .

Quinolone Analogues(3)Synthesis of 1,3-Dialkyl-4-oxo-1,4-dihydropyridazino[3,4-b]quinoxalines

S. Ohshima, Y. Okamoto, M. Ogura, 2001 .

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

Y. Okamoto, Y. Kurasawa, Ho Sik Kim, 2000 .

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

Y. Okamoto, S. Han, Y. Kurasawa, 1998 .

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

Y. Okamoto, Y. Kurasawa, Ho Sik Kim, 1998 .

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

Geuk Jeong, Y. Okamoto, Yong-Tae Park, 1998 .

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

Y. Okamoto, Yong-Tae Park, Y. Kurasawa, 1997 .

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

Y. Okamoto, Y. Kurasawa, Ho Sik Kim, 1997 .

A new method for the synthesis of 4H‐1,3,4‐thiadiazino[5,6‐b]quinoxalines

Y. Okamoto, M. Sekine, Y. Kurasawa, 1996 .

Tautomeric structure of 1-methyldihydropyridazino-[3,4-b]quinoxalines in solution

Y. Okamoto, A. Takada, Y. Kurasawa, 1993 .

Synthesis of 1,2‐diazepino[3,4‐b]quinoxalines and pyrido[3′,4′:9,8][1,5,6]oxadiazonino[3,4‐b]quinoxalines via a 1,3‐dipolar cycloaddition reaction

Y. Okamoto, A. Takada, Y. Kurasawa, 1993 .

A convenient synthesis of 1,2,4-triazolo[4,3,2-o,p]-[1,3]diazocino[4,5-b]quinoxalines via a 1,3-dipolar cycloaddition reaction and a ring transformation

Y. Okamoto, A. Takada, Y. Kurasawa, 1992 .

Reaction of 2‐(5‐aminopyrazol‐1‐yl)quinoxaline 4‐oxides with dimethyl acetylenedicarboxylate

Y. Okamoto, A. Takada, Y. Kurasawa, 1992 .

A convenient synthesis of 1,2‐diazepino[3,4‐b]‐quinoxalines via a 1,3‐dipolar cycloaddition reaction and their tautomeric structure in a solution

Y. Okamoto, A. Takada, Y. Kurasawa, 1990 .

Synthesis of pyridazino[3,4‐b]quinoxalines and pyrazolo[3,4‐b]‐quinoxaline by 1,3‐dipolar cycloaddition reaction

Y. Okamoto, A. Takada, Y. Kurasawa, 1990 .

Synthesis of pyrrolo[1,2-a]quinoxalines by 1,3-dipolar cycloaddition reaction. An additional reaction mechanism via an aziridine intermediate

Y. Okamoto, A. Takada, Y. Kurasawa, 1990 .

A facile synthesis of novel 1,2-diazepino[3,4-b]quinoxalines by a 1,3-dipolar cycloaddition reaction

Y. Okamoto, A. Takada, Y. Kurasawa, 1990 .

A convenient synthesis of novel pyridazino[3,4-b]quinoxaline and pyrazolo[3,4-b]quinoxaline utilizing 1,3-dipolar cycloaddition reaction

A. Takada, Y. Kurasawa, Ho Sik Kim, 1989 .

A selective synthesis of novel isoxazolo[2, 3-a]-quinoxalines and pyrrolo[1, 2-a]quinoxalines

A. Takada, Y. Kurasawa, Ho Sik Kim, 1989 .

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

K. Sakurai, Y. Okamoto, K. Harada, 2000 .

Facile synthesis and antifungal activity of 3-substituted 4-amino-8-ethoxycarbonylpyrazolo[5,1-c][1,2,4]triazines and pyrazolo[1′,5′:3,4][1,2,4]triazino[5,6-b][1,5]benzodiazepines†

Y. Okamoto, A. Takada, Y. Kamigaki, 1988 .

A new method for the synthesis of novel 3-substituted 4-amino-8-ethoxycarbonylpyrazolo[5,1-c][1,2,4]triazines and pyrazolo[1′,5′:3,4][1,2,4]triazino[5,6-b][1,5]benzodiazepines

Y. Okamoto, A. Takada, Y. Kurasawa, 1987 .

Hydrolysis of 4-cyano-1-ethoxypyrimido[1,6-a]benzimidazole: Formation of a ynaminonitrile and benzimidazolidines

K. Takagi, A. Takada, Y. Kurasawa, 1995 .

Conversion of 4-amino-1H-1,5-benzodiazepine-3-carbonitrile to pyrazolo[3,4-d]pyrimidines, pyrimido[1,6-a]benzimidazole, and pyrazolo[3′,4′:4,5]pyrimido[1,6-a]benzimidazoles†

K. Takagi, Y. Okamoto, Y. Kurasawa, 1986 .

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.

Y. Kurasawa, Ho Sik Kim, Seong-Uk Lee, 2002 .

Synthesis of Tetrazolo(1,5-a)quinoxalines with Antimicrobial Activity

Dong Eun Kim, Y. Kurasawa, Ho Sik Kim, 2001 .

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

Y. Okamoto, Kyung-Ok Choi, Y. Kurasawa, 2000 .

Reaction of azole condensed quinoxaline N‐oxides with acetic anhydride

Y. Okamoto, K. Ikeda, A. Takada, 1994 .

NMR study on the tautomeric equilibria between the hydrazone imine and diazenyl enamine forms in side chained quinoxalines : solvent effects and temperature dependence

Y. Okamoto, K. Ikeda, A. Takada, 1994 .

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

Geuk Jeong, Y. Okamoto, Yong-Tae Park, 2000 .

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

Y. Okamoto, A. Takada, Y. Kurasawa, 1985 .

Synthesis of 3-(α-chlorophenylhydrazono)heteroarylmethyl-2-oxo-1,2-dihydroquinoxalines with antimicrobial activity†

Y. Okamoto, A. Takada, K. Yamazaki, 1986 .

A convenient synthesis and antifungal activity of 1‐aryl‐1H‐ and 1‐aryl‐3‐heteroaryl‐1H‐pyrazolo[3,4‐b]quinoxalinesA Convenient Synthesis and Antifungal Activity

Y. Okamoto, A. Takada, K. Yamazaki, 1986 .

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

Y. Okamoto, A. Takada, Y. Kurasawa, 1985 .

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

Y. Okamoto, A. Takada, Y. Kurasawa, 1985 .

1H-NMR study on the tautomer ratios between the hydrazone imine and diazenylenamine forms in 3-(arylhydrazono)-methyl-2-oxo-1,2-dihydroquinoxalines

Y. Okamoto, A. Takada, Kyoko Kato, 1996 .

A convenient synthesis of 3-formyl-2-oxo-1,2-dihydroquinoxaline chlorophenylhydrazones: Novel tautomeric equilibria between hydrazone imine and diazenyl enamine forms with long-range pSSrototropy

Y. Okamoto, A. Takada, K. Yamazaki, 1986 .

A new method for the synthesis of novel 1-aryl-3-heteroaryl-1H-pyrazolo[3,4-b]quinoxalines

Y. Okamoto, A. Takada, K. Yamazaki, 1986 .

SYNTHESIS OF 1,3,4-THIADIAZINO[5,6-B]QUINOXALINES WITH ANTIMICROBIAL ACTIVITY

H. S. Kim, T. E. Kim, Y. Kurasawa, 2003 .

Selective reduction by 2‐amino‐4‐methylpyridine borane and 2‐aminopyrimidine borane

T. Kinoshita, Y. Okamoto, Y. Kurasawa, 1986 .

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

S. S. Kim, Yong-Tae Park, Y. Kurasawa, 1997 .

Synthesis and evaluation of 1H‐pyrazolo[3,4‐b]quinoxalines and 1‐aryl‐3‐quinoxalinyl‐1,2,4‐triazole as antibacterial agent

A. Takada, Yong-Tae Park, Y. Kurasawa, 1996 .

A New Synthesis of Novel 1‐Aryl‐3‐heteroaryl‐1H‐pyrazolo[3,4‐b]quinoxalines via a Key‐Intermediate.

Y. Okamoto, A. Takada, K. Yamazaki, 1986 .

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

Hideyuki Ito, E. Kaji, K. Sasaki, 2010 .

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

Y. Okamoto, A. Takada, Y. Kurasawa, 1985 .

Substituent and solvent effects on the tautomer ratios between the hydrazone imine and diazenyl enamine forms in p‐ and m‐substituted 3‐(arylhydrazono)methyl‐2‐oxo‐1,2‐dihydroquinoxalines

Y. Okamoto, A. Takada, Y. Kurasawa, 1995 .

Characteristic Tautomerism and Isomerization in the Quinoxaline Chemistry

A. Takada, Y. Kurasawa, 1986 .

A facile synthesis of 1-aryl-3-heteroaryl-1H-pyrazolo[3,4-b]quinoxalines and related compounds with antifungal activitySynthesis of 1-Aryl-3-heteroaryl-1H-pyrazolo[3,4-b]quinoxalines†

Y. Okamoto, A. Takada, K. Yamazaki, 1986 .

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

Y. Okamoto, A. Takada, K. Yamazaki, 1986 .

Synthesis of 1,3,4-Thiadiazines and 1,3,4-Oxadiazines

Y. Kurasawa, H. Kim, 1999 .

Synthesis and 13C‐NMR study of novel pyrazolo[5′,1′:3, 4][1, 2, 4]triazino[5, 6‐d]pyrimidines

Y. Okamoto, A. Takada, Y. Kamigaki, 1989 .

A facile synthesis of novel pyrazolo[5',1':3,4][1,2,4]triazino[6,5-f][1,3,4]thiadiazepines

Y. Okamoto, A. Takada, Y. Kamigaki, 1989 .

A selective synthesis of 1-aryl-3-quinoxalinyl-1,2,4-triazole and furo[2,3-b]quinoxaline

A. Takada, Y. Kurasawa, H. Kim, 1989 .

A new method for the synthesis of novel 6‐quinoxalinylpyrazolo[5,1‐c][1,2,4]triazines

A. Satoh, Y. Okamoto, A. Takada, 1987 .

A Facile Synthesis of 1-Aryl-3-heteroaryl-1H-pyrazolo(3,4-b)quinoxalines and Related Compounds with Antifungal Activity.

Y. Okamoto, A. Takada, K. Yamazaki, 1987 .

Synthesis and reactions of 3-(1,3,4-oxadiazol-2-yl)methylene-2-oxo-1,2,3,4-tetrahydroquinoxalines.

A. Takada, Y. Kurasawa, Yujiro Moritaki, 1983 .

Tautomeric behavior of 3-(α-arylhydrazono)methyl-2-oxo-1,2-dihydroquinoxalines between hydrazone imine and diazenyl enamine forms

Y. Okamoto, A. Takada, K. Yamazaki, 1986 .

Synthesis of Quinoxaline 4-Oxides with Antimicrobial Activity and Their Cyclization into Pyridazino(3,4-b)quinoxaline

J. Hur, Ho-Sik Kim, Y. Kurasawa, 2002 .

Synthesis and tautomeric behavior of 3-(pyrazolylhydrazonomethyl)-2-oxo-1, 2-dihydroquinoxalines. Specification of hydrazone imine and diazenyl enamine forms

Y. Okamoto, K. Yonekura, A. Takada, 1989 .

A new synthesis of 1,5-dihydropyridazino[3,4-b]quinoxalines and 2-(pyrazol-4-yl)quinoxalines†

Y. Okamoto, A. Takada, Kyoko Kato, 1996 .

Synthesis and Tautomeric Behavior of 3-(Pyrazolylhydrazonomethyl)-2-oxo-1,2-dihydroquinoxalines. Specification of Hydrazone Imine and Diazenyl Enamine Forms.

Y. Okamoto, K. Yonekura, A. Takada, 1989 .

A Convenient Synthesis of Pyridazino [4, 5-b] quinolines and Pyrrolo [3, 4-b] quinolines

A. Takada, Y. Kurasawa, 1980 .

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

Y. Kurasawa, H. Kim, 1998 .

A New Synthesis of 1,5‐Dihydropyridazino(3,4‐b)quinoxalines (VII) and 2‐(Pyrazol‐4‐yl)quinoxalines (VI).

Y. Okamoto, A. Takada, Kyoko Kato, 1996 .

A CONVENIENT SYNTHESIS OF PYRIDAZINO(4,5-B)QUINOLINES AND PYRROLO(3,4-B)QUINOLINES

A. Takada, Y. Kurasawa, 1980 .

Synthesis and Biological Activity of 1,5‐Dihydropyridazino[3,4‐b]quinoxalines and a New Class of Quinolones

Y. Kurasawa, H. Kim, 1999 .

A convenient synthesis of 5,14-methano-16-oxo-1,5,6-benzoxadiazonino[3,4-b]quinoxalines utilizing a 1,3-dipolar cycloaddition reaction and an intramolecular alcoholysis†

Y. Okamoto, A. Takada, Y. Kurasawa, 1991 .

A convenient synthesis of 1,4-dihydro-4-oxopyridazino[3,4-b]quinoxalines by a ring transformation of 1,2-diazepino[3,4-b]quinoxalines

Y. Okamoto, A. Takada, Y. Kurasawa, 1991 .

A facile synthesis of 5,14-methano-16-oxo-1,5,6-benzoxadiazonino[3,4-b]quinoxalines by a 1,3-dipolar cycloaddition reaction and an intramolecular alcoholysis

Y. Okamoto, A. Takada, Y. Kurasawa, 1990 .

CONVERSION OF 3-(N,N-DIMETHYLAMINOCARBONYL)FURO(2,3-B)QUINOXALINE TO NOVEL PYRIDAZINO(3,4-B)QUINOXALINES

A. Takada, Y. Kurasawa, 1980 .

Synthesis of 4-substituted 1,2-dihydropyridazino(3,4-b)quinoxalines from 3-(N,N-dimethylaminocarbonyl)furo(2,3-b)quinoxaline.

A. Takada, Y. Kurasawa, 1980 .

A NEW SYNTHESIS OF FURO(2,3-B)QUINOXALINE AND ITS RING CONVERSIONS

A. Takada, Y. Kurasawa, 1980 .

Ring transformation of 1,5-benzoxazepines into spirobenzoxazoles. Synthesis of pyrazolo[1′,5′:3,4][1,2,4]triazino-[5,6-b][1,5]benzoxazepines and spiro[benzoxazole-2′(3′H),4(1H)-pyrazolo[5,1-c][1,2,4]triazines]†

Y. Okamoto, A. Takada, Y. Kamigaki, 1988 .

Recent progress in the quinoxaline chemistry: utility of 3-alkoxy-carbonylmethylene-2-oxo-1,2,3,4-tetrahydroquinoxalines as starting materials

A. Takada, Y. Kurasawa, 1985 .

Color reaction of cholesterol with the antimony trichloride reagent.

A. Takada, Y. Kurasawa, T. Ueda, 1976, Chemical & pharmaceutical bulletin.

Reaction of 6‐chloro‐2‐[1‐methyl‐2‐(N‐methylthiocarbamoyl)]‐hydrazinoquinoxaline 4‐oxide with dimethyl acetylenedicarboxylate

Y. Okamoto, A. Takada, Y. Kurasawa, 1992 .

Synthesis of 2-arylhydrazono-4-chloro-3-oxobutanoates existing as (E)/(Z)-hydrazone isomers in solution: Correlation between equilibrium constants and substituent constants

E. Kaji, N. Sato, N. Yamazaki, 2020 .