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1

A new synthesis of 1,2,3-thiadiazolo(4,5-d)pyrimidines

Keitaro Senga, Misuzu Ichiba, Sadao Nishigaki

Journal:

Tetrahedron Letters

Year:

1976

Language:

english

File:

PDF, 168 KB

english, 1976

2

On the pyrimidine synthesis from ethyl ethoxymethylenecyanoacetate and amidines

Sadao Nishigaki, Kyoko Aida, Keitaro Senga, Fumio Yoneda

Journal:

Tetrahedron Letters

Year:

1969

Language:

english

File:

PDF, 193 KB

english, 1969

3

Synthesis of iminodipyrimidines

Sadao Nishigaki, Keitaro Senga, Kazuko Ogiwara, Fumio Yoneda

Journal:

Tetrahedron Letters

Year:

1969

Language:

english

File:

PDF, 159 KB

english, 1969

4

Synthesis and antischistosomal activity of certain pyrazolo[1,5-a]pyrimidines

Senga, Keitaro, Novinson, Thomas, Wilson, Henry R., Robins, Roland K.

Journal:

Journal of Medicinal Chemistry

Year:

1981

Language:

english

File:

PDF, 448 KB

english, 1981

5

Synthesis and antitrichomonal activity of certain pyrazolo[1,5-a]pyrimidines

Senga, Keitaro, Novinson, Thomas, Springer, Robert H., Rao, Ravindra P., O'Brien, Darrell E., Robins, Roland K., Wilson, Henry R.

Journal:

Journal of Medicinal Chemistry

Year:

1975

Language:

english

File:

PDF, 416 KB

english, 1975

6

Synthesis of unsymmetrical 2,4-dialkylpyrazolo[1,5-a]-1,3,5-triazines

Thomas Novinson, Keitaro Senga, Jože Kobe, Roland K. Robins, Darrell E. O'Brien, Anthony A. Albert

Journal:

Journal of Heterocyclic Chemistry

Year:

1974

File:

PDF, 330 KB

1974

7

Synthesis of pyrazolo[1′,5′:1,2]-1,3,5-triazino[5,6-a]benzimidazoles

Keitaro Senga, Roland K. Robins, Darrell E. O'Brien

Journal:

Journal of Heterocyclic Chemistry

Year:

1975

File:

PDF, 208 KB

1975

8

Mass spectra of substituted pyrazolo[1,5-a]-1,3,5-triazines

Hassan S. El Khadem, Rodger L. Foltz, Thomas Novinson, Keitaro Senga

Journal:

Journal of Heterocyclic Chemistry

Year:

1975

File:

PDF, 402 KB

1975

9

Synthesis of 1,3-dialkylpyrazolo [1,5-a]-1,3,5-triazine-2,4-diones isomers of 1,3-dialkylxanthines

Keitaro Senga, Joze Kobe, Roland K. Robins, Darrell E. O'Brien

Journal:

Journal of Heterocyclic Chemistry

Year:

1975

File:

PDF, 448 KB

1975

10

Synthesis of certain imidazo[2,1-f] pyrazolo[3,4-d] pyrimidines

Keitaro Senga, Roland K. Robins, Darrell E. O'Brien

Journal:

Journal of Heterocyclic Chemistry

Year:

1975

File:

PDF, 157 KB

1975

11

A new synthesis of fervenulin 4-oxide

Misuzu Ichiba, Keitaro Senga, Sadao Nishigaki, Fumio Yoneda

Journal:

Journal of Heterocyclic Chemistry

Year:

1977

File:

PDF, 72 KB

1977

12

New, convenient synthesis of 2-alkyl- and 2-vinylpyrazolo[3,4-d]-pyrimidine derivatives

Keitaro Senga, Yukako Kanamori, Hashime Kanazawa, Sadao Nishigaki

Journal:

Journal of Heterocyclic Chemistry

Year:

1978

File:

PDF, 291 KB

1978

13

A novel synthesis of 8-arylaminotheophyllines

Keitaro Senga, Misuzu Ichiba, Hashime Kanazawa, Sadao Nishigaki, Masatsugu Higuchi, Fumio Yoneda

Journal:

Journal of Heterocyclic Chemistry

Year:

1978

File:

PDF, 218 KB

1978

14

New syntheses of pyrimido[4,5-c]pyridazines related to fervenulin

Keitaro Senga, Junko Sato, Yukako Kanamori, Misuzu Ichiba, Sadao Nishigaki, Mitsukò Noguchi, Fumio Yoneda

Journal:

Journal of Heterocyclic Chemistry

Year:

1978

File:

PDF, 249 KB

1978

15

Synthesis and properties of thiazolo[5,4-d]pyrimidine 1-oxides

Keitaro Senga, Misuzu Ichiba, Hashime Kanazawa, Sadao Nishigaki

Journal:

Journal of Heterocyclic Chemistry

Year:

1982

File:

PDF, 297 KB

1982

16

Construction of pyrimido[5,4-e]-as-triazine, purine, v-triazolo-[4,5-d]pyrimidine and pyrazolo[3,4-d]pyrimidine ring systems from 5-arylazo-6-arylidenehydrazino-1,3-dimethyluracils

Sadao Nishigaki, Misuzu Ichiba, Kiyoko Fukami, Keitaro Senga

Journal:

Journal of Heterocyclic Chemistry

Year:

1982

File:

PDF, 259 KB

1982

17

A new synthesis of pyrimido[5,4-e]-as-triazine 4-oxides and their ring transformation to pyrrolo[3,2-d]pyrimidines

Sadao Nishigaki, Hashime Kanazawa, Yukako Kanamori, Misuzu Ichiba, Keitaro Senga

Journal:

Journal of Heterocyclic Chemistry

Year:

1982

File:

PDF, 214 KB

1982

18

Synthesis and xanthine oxidase inhibitory activity of 4,6-disubstituted 1-p-chlorophenylpyrazolo[3,4-d]pyrimidines

Keitaro Senga, Roland K. Robins

Journal:

Journal of Heterocyclic Chemistry

Year:

1982

File:

PDF, 152 KB

1982

19

N-bromosuccinimide in heterocyclic synthesis. Synthesis of pyrazolo[3,4-d]pyrimidines, Pyrimido[5,4-e]-as-triazines, and pyrimido[4,5-c]pyridazines from 6-arylidenehydrazino-1,3-dimethyluracil derivatives

Hashime Kanazawa, Sadao Nishigaki, Keitaro Senga

Journal:

Journal of Heterocyclic Chemistry

Year:

1984

File:

PDF, 359 KB

1984

20

Reaction of 6-arylidenehydrazino-1,3-dimethyluracils with thionyl chloride leading to purine, thiazolo[4,5-d]pyrimidine, pyrimido[4,5-e][1,3,4]thiadiazine, pyrazolo[3,4-d]pyrimidine, and [1,2,3]thiadiazolo[4,5-d]pyrimidine derivativese

Misuzu Ichiba, Keitaro Senga

Journal:

Journal of Heterocyclic Chemistry

Year:

1985

File:

PDF, 258 KB

1985

21

Purine analog inhibitors of xanthine oxidase - structure activity relationships and proposed binding of the molybdenum cofactor

Roland K. Robins, Ganapathi R. Revankar, Darrell E. O'Brien, Robert H. Springer, Thomas Novinson Anthony Albert, Keitaro Senga, Jon P. Miller, David G. Streeter

Journal:

Journal of Heterocyclic Chemistry

Year:

1985

File:

PDF, 1.43 MB

1985

22

Synthetic antibacterials. VIII. 7-(1′-alkylhydrazino)-1,8-naphthyridines and related compounds

Sadao Nishigaki, Noriko Mizushima, Hashime Kanazawa, Misuzu Ichiba, Keitaro Senga

Journal:

Journal of Heterocyclic Chemistry

Year:

1985

File:

PDF, 224 KB

1985

23

Synthesis and enzymic activity of various substituted pyrazolo[1,5-a]-1,3,5-triazines as adenosine cyclic 3',5'-phosphate phosphodiesterase inhibitors

Senga, Keitaro, O'Brien, Darrell E., Scholten, Mieka B., Novinson, Thomas, Miller, Jon P., Robins, Roland K.

Journal:

Journal of Medicinal Chemistry

Year:

1982

Language:

english

File:

PDF, 871 KB

english, 1982

24

New syntheses of pyrido[3,2-d]pyrimidines

Keitaro Senga, Kiyoko Fukami, Hashime Kanazawa, Sadao Nishigaki

Journal:

Journal of Heterocyclic Chemistry

Year:

1982

File:

PDF, 229 KB

1982

25

Synthesis of pyrazolo[3,4-d]pyrimidines by intramolecular cycloaddition of azahexatrienes

Yoneda, Fumio, Nagamatsu, Tomohisa, Nagamura, Tetsuya, Senga, Keitaro

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1977

Language:

english

File:

PDF, 280 KB

english, 1977

26

Synthesis and properties of [1,2,3]thiadiazolo[4,5-d]pyrimidine derivatives including their mesoionic compounds. A new class of heterocycles

Senga, Keitaro, Ichiba, Misuzu, Nishigaki, Sadao

Journal:

Journal of Organic Chemistry

Year:

1978

Language:

english

File:

PDF, 762 KB

english, 1978

27

1,3-Dipolar cycloaddition of a thiazolo [5,4-d]pyrimidine 1-oxide to dimethyl acetylenedicarboxylate. New ring transformation to a pyrrolo-[3,2-d]pyrimidine via a pyrimido [4,5-b][1,4]thiazine

Senga, Keitaro, Ichiba, Misuzu, Kanazawa, Hashime, Nishigaki, Sadao

Journal:

Journal of the Chemical Society Chemical Communications

Year:

1981

Language:

english

File:

PDF, 193 KB

english, 1981

28

Further studies on the ring transformation of pyrimido[5,4-e]-as-triazine 4-oxides to pyrrolo[3,2-d]pyrimidines involving 1,3-dipolar cycloaddition reaction

Kanazawa, Hashime, Ichiba, Misuzu, Shimizu, Nobuyuki, Tamura, Zenzo, Senga, Keitaro

Journal:

Journal of Organic Chemistry

Year:

1985

Language:

english

File:

PDF, 1.17 MB

english, 1985

29

New synthesis of purines from the reaction of 6-amino-1,3-dimethyl-5-nitrosouracil with benzylidenetriphenylphosphoranes

Senga, Keitaro, Kanazawa, Hashime, Nishigaki, Sadao

Journal:

Journal of the Chemical Society Chemical Communications

Year:

1976

Language:

english

File:

PDF, 100 KB

english, 1976

30

Syntheses of azolopyrimido[5,4-e]-as-triazines and azolopyrimido[4,5-c]pyridazines related to fervenulin

Nishigaki, Sadao, Ichiba, Misuzu, Senga, Keitaro

Journal:

Journal of Organic Chemistry

Year:

1983

Language:

english

File:

PDF, 476 KB

english, 1983

31

New synthesis of pyrrolo[3,2-d]pyrimidines (9-deazapurines) by the 1,3-dipolar cycloaddition reaction of fervenulin 4-oxides with acetylenic esters

Senga, Keitaro, Ichiba, Misuzu, Nishigaki, Sadao

Journal:

Journal of Organic Chemistry

Year:

1979

Language:

english

File:

PDF, 610 KB

english, 1979

32

Synthesis of fervenulin 4-oxide and its conversion to the antibiotics fervenulin and 2-methylfervenulone

Ichiba, Misuzu, Nishigaki, Sadao, Senga, Keitaro

Journal:

Journal of Organic Chemistry

Year:

1978

Language:

english

File:

PDF, 509 KB

english, 1978

33

Novel heterocyclic nitrofurfural hydrazones. In vivo antitrypanosomal activity

Novinson, Thomas, Bhooshan, Bharat, Okabe, Takayuki, Revankar, Ganapathi R., Robins, Roland K., Senga, Keitaro, Wilson, H. Robert

Journal:

Journal of Medicinal Chemistry

Year:

1976

Language:

english

File:

PDF, 577 KB

english, 1976

34

New synthesis of 1,3-dimethylcytosines

Yoneda, Fumio, Senga, Keitaro, Nishigaki, Sadao

Journal:

Journal of Organic Chemistry

Year:

1971

Language:

english

File:

PDF, 365 KB

english, 1971

35

Additions and Corrections - Further Studies on the Ring Transformation of Pyrimido[5,4-e]-as-triazine 4-Oxides to Pyrrolo[3,2-d]pyrimidines Involving 1,3-Dipolar Cycloaddition Reactions.

Kanazawa, Hashime, Ichiba, Misuzu, Shimizu, Nobuyuki, Tamura, Zenzo, Senga, Keitaro

Journal:

Journal of Organic Chemistry

Year:

1986

Language:

english

File:

PDF, 87 KB

english, 1986

36

A new synthesis of disubstituted 8-aminopurine derivatives

Yoneda, Fumio, Matsumura, Takafumi, Senga, Keitaro

Journal:

Journal of the Chemical Society Chemical Communications

Year:

1972

Language:

english

File:

PDF, 109 KB

english, 1972

37

New synthesis of pteridines from the reaction of 6-amino-1,3-dimethyl-5-nitrosouracil with phenacylidenetriphenylphosphoranes

Senga, Keitaro, Kanazawa, Hashime, Nishigaki, Sadao

Journal:

Journal of the Chemical Society Chemical Communications

Year:

1976

Language:

english

File:

PDF, 96 KB

english, 1976

38

A New, Convenient Synthesis of 2-Alkyl- and 2-Vinylpyrazolo [3,4- d ]pyrimidine Derivatives

SENGA, Keitaro, KANAMORI, Yukako, KANAZAWA, Hashime, NISHIGAKI, Sadao, YONEDA, Fumio

Journal:

Year:

1977

File:

PDF, 91 KB

1977

39

Synthesis of Pyrido[3,2- d ]pyrimidines by lntramolecular Cycloaddition of Azahexatrienes

Senga, Keitaro, Furukawa, Kiyoko, Nishigaki, Sadao

Journal:

Year:

1980

File:

PDF, 156 KB

1980

40

A New Synthesis of Substituted 8-Aminopurine Derivatives

Yoneda, Fumio, Higuchi, Masatsugu, Matsumura, Takafumi, Senga, Keitaro

Journal:

Bulletin of the Chemical Society of Japan

Year:

1973

File:

PDF, 555 KB

1973

41

Synthetic Antibacterials. II. Synthesis of Pyrido [2, 3-d] pyrimidine Derivatives. (1)

NISHIGAKI, SADAO, OGIWARA, KAZUKO, SENGA, KEITARO, FUKAZAWA, SHINOBU, YONEDA, FUMIO, AIDA, KYOKO, MACHIDA, YOSHIHARU

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1970

File:

PDF, 940 KB

1970

42

Synthesis of 1, 3-Dialkylcytosine Derivatives

NISHIGAKI, SADAO, SENGA, KEITARO, YONEDA, FUMIO

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1971

File:

PDF, 455 KB

1971

43

Condensation Reactions of Ethyl Ethoxymethylenecyanoacetate with Amidines

NISHIGAKI, SADAO, SENGA, KEITARO, AIDA, KYOKO, TAKABATAKE, TOYOMI, YONEDA, FUMIO

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1970

File:

PDF, 649 KB

1970

44

A Convenient Synthesis of 1, 3-Dialkyl-5, 5-dichlorobarbituric Acids

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1971

File:

PDF, 314 KB

1971

45

A Novel Synthesis of Iminodipyrimidines

NISHIGAKI, SADAO, SENGA, KEITARO, OGIWARA, KAZUKO, YONEDA, FUMIO

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1970

File:

PDF, 750 KB

1970

46

Dimethylamination and Formylation of Pyrimidines with Dimethylformamide

NISHIGAKI, SADAO, SENGA, KEITARO, YONEDA, FUMIO

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1971

Language:

english

File:

PDF, 722 KB

english, 1971

47

Intermolecular Dimethylamination and Formylation with Dimethylformamide

SENGA, KEITARO, YONEDA, FUMIO, NISHIGAKI, SADAO

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1971

File:

PDF, 362 KB

1971

48

Syntheses and Properties of Some Pyrrolo [2, 3-d] pyrimidine Derivatives

YONEDA, FUMIO, HIGUCHI, MASATSUGU, SENGA, KEITARO, KANAHORI, MICHIKO, NISHIGAKI, SADAO

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1973

Language:

english

File:

PDF, 779 KB

english, 1973

49

Dimethylamination and Nitrosation of Pyrimidines with N-Nitrosodimethylamine

YONEDA, FUMIO, SENGA, KEITARO, NISHIGAKI, SADAO

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1973

Language:

english

File:

PDF, 616 KB

english, 1973

50

Synthetic antibacterials. V. 7-Substituted 1-ethyl-1,4-dihydro-4-oxo-1,8-naphthyridine-3-carboxylic acids.

NISHIGAKI, SADAO, ICHIBA, MISUZU, FUKAZAWA, SHINOBU, KANAHORI, MICHIKO, SHINOMURA, KAZUKO, YONEDA, FUMIO, SENGA, KEITARO

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1975

File:

PDF, 727 KB

1975

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