Author

Masayoshi Yamaoka

Observed name: Masayoshi Yamaoka

Observed institution: Takeda (Japan)

OpenAlex ID: A5113531734

Studies on condensed-heterocyclic azolium cephalosporins. IV. Synthesis and antibacterial activity of 7.BETA.-(2-(5-amino-1,2,4-thiadizol-3-yl)-2(Z)-alkoxyiminoacetamido)-3-(condensed-heterocyclic azolium)methyl cephalosporins including SCE-2787.

1992 · AKIO MIYAKE, YOSHINOBU YOSHIMURA, et al. · The Journal of Antibiotics · 41

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Orally active 1-(cyclohexyloxycarbonyloxy)alkyl ester prodrugs of cefotiam.

1987 · TATSUO NISHIMURA, YOSHINOBU YOSHIMURA, et al. · The Journal of Antibiotics · 31

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A new cephalosporin. SCE-963: 7-[2-(2-aminothiazol-4-yl)-acetamido]-3-[[[1-(2-dimethylaminoethyl)-1H-tetrazol-5-yl]-thio]methyl]ceph-3-em-4-carboxylic acid. Chemistry and structure-activity relationships.

1978 · MITSUO NUMATA, ISAO MINAMIDA, et al. · The Journal of Antibiotics · 28

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A Convenient Synthesis of 4(5)-Alkylacyl-1 H -imidazoles from 4(5)-Imidazolecarboxaldehyde

2003 · Jun-ichi Kawakami, Kazuhiro Kimura, et al. · Synthesis · 19

Synthesis of new cephalosporins with potent antibacterial activities.

1977 · MITSUO NUMATA, ISAO MINAMIDA, et al. · Chemical and Pharmaceutical Bulletin · 17

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Novel transformations of penicillins into 2-azetidinones with diazo- and azido-compounds and a novel synthesis of desacetoxycephalosporin

1972 · Mitsuo Numata, Yoshio Imashiro, et al. · Tetrahedron Letters · 17

Studies on condensed-heterocyclic azolium cephalosporins. I. Synthesis and antibacterial activity of 7.BETA.-(2-(2-aminothiazol-4-yl)-2(Z)-alkoxyiminoacetamido)-3-(imidazo(1,2-a)pyridinium-1-yl)methyl-3-cephem-4-carboxylates.

1991 · TATSUO NISHIMURA, YOSHINOBU YOSHIMURA, et al. · The Journal of Antibiotics · 7

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New cephalosporins with 7-acyl groups derived from .BETA.-ketoacids. I. 7-(.BETA.-Ketoacylamino)cephalosporins.

1978 · MITSUO NUMATA, MASAYOSHI YAMAOKA, et al. · The Journal of Antibiotics · 5

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A Concise Synthesis of Racemic 1-(6,7-Dimethoxy-2-naphthyl)-1-(1 H -imidazol-4-yl)-2-methylpropan-1-ol for a Potent C 17 , 20 -Lyase Inhibitor

2007 · Jun-ichi Kawakami, Kazuhiro Kimura, et al. · Organic Process Research & Development · 4

A Novel Oxidation-Acetylation of Hydroxysulfides

1970 · MITSUO NUMATA, MASAYOSHI YAMAOKA, et al. · Chemical and Pharmaceutical Bulletin · 4

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Studies on condensed-heterocyclic azolium cephalosporins. II. Synthesis and antibacterial activity of 7.BETA.-(2-(2-aminothiazol-4-yl)-2(Z)-alkoxyiminoacetamido)-3-(condensed-heterocyclic azolium)methyl-3-cephem-4-carboxylates.

1991 · YOSHINOBU YOSHIMURA, AKIO MIYAKE, et al. · The Journal of Antibiotics · 3

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New cephalosporins with 7-acyl groups derived from .BETA.-ketoacids. II. Further modifications of 7-(3-oxobutyrylamino)-cephalosporins.

1978 · MITSUO NUMATA, ISAO MINAMIDA, et al. · The Journal of Antibiotics · 3

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Synthesis of 1‐([1‐14C] cyclohexyloxycarbonyloxy) ethyl 7β‐[2‐(2‐aminothiazol‐4‐YL)acetamido]‐3‐[[[1‐(2‐dimethylamino‐ethyl)‐1H‐tetrazol‐5‐YL]thio]methyl]ceph‐3‐EM‐4‐carboxylate dihydrochloride ([14C]SCE‐2174)

1988 · Masazumi Watanabe, Norio Tada, et al. · Journal of Labelled Compounds and Radiopharmaceuticals · 1

Retraction notice to ‘Corrigendum to “3-Benzhydryl-4-piperidones as novel neurokinin-1 receptor antagonists and their efficient synthesis”’ [Bioorg. Med. Chem. 20 (2012) 5668–5668]

2014 · Junya Shirai, Masayoshi Yamaoka, et al. · Bioorganic & Medicinal Chemistry

RETRACTED: Corrigendum to “3-Benzhydryl-4-piperidones as novel neurokinin-1 receptor antagonists and their efficient synthesis” [Bioorg. Med. Chem. 19 (2011) 5175–5182]

2012 · Junya Shirai, Masayoshi Yamaoka, et al. · Bioorganic & Medicinal Chemistry

A Convenient Synthesis of 4(5)‐Alkylacyl‐1H‐imidazoles from 4(5)‐Imidazolecarboxaldehyde.

2003 · Jun‐ichi Kawakami, Kazuhiro Kimura, et al. · ChemInform

Works count: 16

Citation count: 180

H-index: 7

I10-index: 6