Otomasu, Hirotaka: search on Z-Library

The world's largest scientific articles store. 70,000,000+ articles for free.

Don't use scam websites

51

Spiro heterocyclic compounds. V. Synthesis of spiro(homophthalimide-4,4'-(4'H-pyran)) compounds.

FUJIMAKI, TERUHISA, OTOMASU, HIROTAKA

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1982

File:

PDF, 612 KB

1982

52

Spiro heterocyclic compounds. III. Synthesis of spiro[oxindole-3,4'-(4'H-pyran)] compounds.

HIGASHIYAMA, KIMIO, OTOMASU, HIROTAKA

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1980

File:

PDF, 485 KB

1980

53

Studies on the syntheses of heterocyclic compounds and natural products. MXVI. Aziridine in alkaloid synthesis. 6. Alternative synthesis of isopavine-type alkaloid, (.+-.)-reframidine.

KAMETANI, TETSUJI, HIGASHIYAMA, KIMIO, HONDA, TOSHIO, OTOMASU, HIROTAKA

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1984

File:

PDF, 536 KB

1984

54

Synthesis of condensed quinoxalines. VI. Synthesis of 1H-pyrazolo(3,4-b)quinoxaline N-oxides and related compounds.

YOSHIDA, KEI, OTOMASU, HIROTAKA

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1984

File:

PDF, 624 KB

1984

55

An effective transformation of (-)-cytisine-type lupin alkaloids into (-)-tsukushinamine-type alkaloids.

Ohmiya, Shigeru, Otomasu, Hirotaka, Murakoshi, Isamu

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1984

File:

PDF, 352 KB

1984

56

Michael reactions of 4-acylmethylene-1,3(2H,4H)-isoquinolinediones with malononitrile.

FUJIMAKI, TERUHISA, NAGASE, HIROMASA, YAMAGUCHI, RYOJI, KAWAI, KENICHI, OTOMASU, HIROTAKA

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1985

File:

PDF, 693 KB

1985

57

Synthesis of 1,3-oxazino(5,6-c)isoquinolines and related compounds.

TOYAMA, MIYOKO, OTOMASU, HIROTAKA

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1985

File:

PDF, 504 KB

1985

58

Absolute configuration of (-)-lusitanine, a new lupin alkaloid in Maackia species.

Saito, Kazuki, Yoshino, Takaaki, Tsai, Shi, Ohmiya, Shigeru, Kubo, Hajime, Otomasu, Hirotaka, Murakoshi, Isamu

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1987

Language:

english

File:

PDF, 289 KB

english, 1987

59

The synthesis of lupin alkaloids. II. A formal synthesis of (.+-.)-sparteine.

TAKATSU, NORIYUKI, NOGUCHI, MASAYO, OHMIYA, SHIGERU, OTOMASU, HIROTAKA

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1987

Language:

english

File:

PDF, 343 KB

english, 1987

60

The synthesis of lupin alkaloids. I Total synthesis of (.+-.)-leontiformine and (.+-.)-leontiformidine.

Takatsu, Noriyuki, Ohmiya, Shigeru, Otomasu, Hirotaka

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1987

Language:

english

File:

PDF, 289 KB

english, 1987

61

Intermolecular photoaddition reaction of aliphatic tert-amines to N-alkyl-2-pyridones.

OHMIYA, Shigeru, NOGUCHI, Masayo, CHEN, Chin-Yuen, MURAKOSHI, Isamu, OTOMASU, Hirotaka

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1989

File:

PDF, 515 KB

1989

62

Studies on Plant Constituents of Genus Maackia. Part V. (-)-Camoensidine N-Oxide; A New Alkaloid from Maackia tashiroi.

OHMIYA, Shigeru, KUBO, Hajime, NAKAAZE, Yuuichi, SAITO, Kazuki, MURAKOSHI, Isamu, OTOMASU, Hirotaka

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1991

File:

PDF, 565 KB

1991

63

On the Nitration of Quinoxalines.

Otomasu, Hirotaka, Nakajima, Shoichi

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1958

File:

PDF, 588 KB

1958

64

Studies on Phenazines. XVIII. Nitration of Phenazine and Its Derivatives. (3).

Otomasu, Hirotaka

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1958

File:

PDF, 651 KB

1958

65

Studies on Phenazines. XII. Synthesis of Methylphenazines with Sodium Amide

KIDANI, Yoshinori, OTOMASU, Hirotaka

Journal:

Pharmaceutical Bulletin

Year:

1956

File:

PDF, 578 KB

1956

66

Studies on Phenazines. VI. : Synthesis of Iodinin Isomers. (3) : Syntheses of 1, 3-, 1, 4-, and 2, 3-Dihydroxyphenazine Di-N-oxides.

Yosioka, Itiro, Otomasu, Hirotaka

Journal:

Pharmaceutical Bulletin

Year:

1954

File:

PDF, 978 KB

1954

67

Studies on Phenazines. VII. : Nitration of Phenazine and its Derivatives.

Otomasu, Hirotaka

Journal:

Pharmaceutical Bulletin

Year:

1954

File:

PDF, 776 KB

1954

68

Studies on Phenazines. IX. Synthesis of Dichlorophenazines

Otomasu, Hirotaka

Journal:

Pharmaceutical Bulletin

Year:

1955

File:

PDF, 606 KB

1955

69

Studies on Phenazines. IV. : Synthesis of Iodinin Isomers. (1). : Syntheses of 2, 7-and 1, 8-Dihydroxyphenazine Di-N-oxides.

Yosioka, Itiro, Otomasu, Hirotaka

Journal:

Pharmaceutical Bulletin

Year:

1953

File:

PDF, 514 KB

1953

70

Studies on Phenazines. XV. The Ring Cleavage of Phenazine. (1). 2, 3-Quinoxalinedicarboxylic Acid.

Yosioka, Itiro, Otomasu, Hirotaka

Journal:

Pharmaceutical Bulletin

Year:

1957

File:

PDF, 451 KB

1957

71

A New Synthesis of Trimethylhydroquinone

OTOMASU, HIROTAKA

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1968

File:

PDF, 412 KB

1968

72

Studies on the Structures of Diazine N-Oxides. II. Dipole Moments of Some Alkoxy-derivatives of Pyrimidine, Pyridazine and their N-Oxides.

Otomasu, Hirotaka, Takahashi, Hiroshi, Ogata, Michihiko

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1964

File:

PDF, 588 KB

1964

73

The structure of tsukushinamine, a new type of lupin alkaloid in Sophora franchetiana.

OHMIYA, SHIGERU, HIGASHIYAMA, KIMIO, OTOMASU, HIROTAKA, HAGINIWA, JOJU, MURAKOSHI, ISAMU

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1979

File:

PDF, 445 KB

1979

74

(+)-13.BETA.-Hydroxymamanine, a new lupin alkaloid from Maackia amurensis var. buergeri.

Saito, Kazuki, Tsai, Sih, Ohmiya, Shigeru, Kubo, Hajime, Otomasu, Hirotaka, Murakoshi, Isamu

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1986

File:

PDF, 390 KB

1986

75

Synthesis of 4-hydroxymethylene-1,3(2H,4H)-isoquinolinediones and related compounds.

HIGASHIYAMA, KIMIO, TOYAMA, MIYOKO, OTOMASU, HIROTAKA

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1986

File:

PDF, 501 KB

1986

76

On the Nitration of Quinoxalines (Addendum)

Otomasu, Hirotaka, Yoshida, Kei

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1960

File:

PDF, 503 KB

1960

77

Studies on Phenazines. XI. Nitration of Phenazine and Its Derivatives.(2)

Otomasu, Hirotaka

Journal:

Pharmaceutical Bulletin

Year:

1956

File:

PDF, 534 KB

1956

78

The alkaloid constituents of Euchresta japonica and the stereochemical assignment of two isomeric sophoridine N-oxides.

OHMIYA, SHIGERU, OTOMASU, HIROTAKA, HAGINIWA, JOJU, MURAKOSHI, ISAMU

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1980

File:

PDF, 736 KB

1980

79

The absolute configuration of tsukushinamine-A. A new cage-type lupin alkaloid from Sophora franchetiana.

BORDNER, JON, OHMIYA, SHIGERU, OTOMASU, HIROTAKA, HAGINIWA, JOJU, MURAKOSHI, ISAMU

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1980

File:

PDF, 463 KB

1980

80

Michael reactions of 3-acylmethyleneoxindoles with active methylene compounds.

HIGASHIYAMA, KIMIO, NAGASE, HIROMASA, YAMAGUCHI, RYOJI, KAWAI, KENICHI, OTOMASU, HIROTAKA

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1985

File:

PDF, 618 KB

1985

81

Photoaddition Reaction of Pyrroles and Indoles to N-Methyl-2-pyridone.

OHMIYA, Sigeru, NOGUCHI, Masayo, INA, Shinji, KUBO, Hajime, OTOMASU, Hirotaka

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1992

File:

PDF, 694 KB

1992

82

1,3-Dipolar cycloaddition reactions of thiazolo[5,4-d]pyrimidine 1-oxides with acetylenic esters involving new ring transformations of the thiazole nucleus.

KANAZAWA, HASHIME, ICHIBA, MISUZU, TAMURA, ZENZO, SENGA, KEITARO, KAWAI, KEN-ICHI, OTOMASU, HIROTAKA

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1987

Language:

english

File:

PDF, 1.53 MB

english, 1987

83

Metabolic Products from Mycelium of Aspergillus itaconicus

Otomasu, Hirotaka, Watanabe, Emiko, Nakajima, Shoichi

Journal:

YAKUGAKU ZASSHI

Year:

1963

Language:

english

File:

PDF, 379 KB

english, 1963

84

Substituent Effects on N-Oxidation and Deoxygenation of Aromatic N-Heterocyclic Compounds. I

Otomasu, Hirotaka, Takahashi, Hiroshi, Yoshida, Kei

Journal:

YAKUGAKU ZASSHI

Year:

1964

File:

PDF, 750 KB

1964

85

Studies on the Structures of Diazine N-Oxides. I

Otomasu, Hirotaka, Yamaguchi, Ryoji, Ishigo-oka, Kazuko, Takahashi, Hiroshi

Journal:

YAKUGAKU ZASSHI

Year:

1962

File:

PDF, 788 KB

1962

86

Synthesis of Condensed Quinoxalines. III. : 1, 2-Dihydroimidazo [1, 2-α]-quinoxalines and 1, 2-Dihydro-3H-pyrimido [1, 2-α] quinoxalines

OTOMASU, HIROTAKA, YOSHIDA, KEI, TAKAHASHI, HIROSHI

Journal:

YAKUGAKU ZASSHI

Year:

1970

File:

PDF, 563 KB

1970

87

Synthesis of 1H-Pyrazolo[3, 4-b]pyridine and Related Compounds

YOSHIDA, KEI, OTOMASU, HIROTAKA

Journal:

YAKUGAKU ZASSHI

Year:

1976

File:

PDF, 550 KB

1976

88

Synthesis by Using Chirality of l-Ephedrine : Asymmetric Synthesis of Alanine and Phenylglycine

TAKAHASHI, HIROSHI, NOGUCHI, HIROMI, TOMITA, KOUICHI, OTOMASU, HIROTAKA

Journal:

YAKUGAKU ZASSHI

Year:

1978

File:

PDF, 628 KB

1978

89

Studies on Phenazines. XIII.

Yosioka, Itiro, Otomasu, Hirotaka

Journal:

YAKUGAKU ZASSHI

Year:

1956

File:

PDF, 519 KB

1956

90

Studies on Phenazines. XXIII

Otomasu, Hirotaka, Yoshida, Kei

Journal:

YAKUGAKU ZASSHI

Year:

1961

Language:

english

File:

PDF, 630 KB

english, 1961

91

Absolute Configuration of (+)-erythro-2-Methylamino-1, 2-diphenylethanol and Asymmetric Synthesis by Using Its Chirality

TAKAHASHI, HIROSHI, TOMITA, KOUICHI, NOGUCHI, HIROMI, OTOMASU, HIROTAKA

Journal:

YAKUGAKU ZASSHI

Year:

1979

File:

PDF, 677 KB

1979

92

Synthesis of Condensed Quinoxalines. I. : On the Reaction of 11-Oxo-11H-indeno [1, 2-b] quinoxaline

OTOMASU, HIROTAKA, OMIYA, SHIGERU

Journal:

YAKUGAKU ZASSHI

Year:

1969

File:

PDF, 449 KB

1969