Hiroshi Ohtaka

502 total citations
33 papers, 406 citations indexed

About

Hiroshi Ohtaka is a scholar working on Organic Chemistry, Molecular Biology and Computational Theory and Mathematics. According to data from OpenAlex, Hiroshi Ohtaka has authored 33 papers receiving a total of 406 indexed citations (citations by other indexed papers that have themselves been cited), including 24 papers in Organic Chemistry, 19 papers in Molecular Biology and 4 papers in Computational Theory and Mathematics. Recurrent topics in Hiroshi Ohtaka's work include Phenothiazines and Benzothiazines Synthesis and Activities (10 papers), Synthesis and Characterization of Heterocyclic Compounds (8 papers) and Quinazolinone synthesis and applications (8 papers). Hiroshi Ohtaka is often cited by papers focused on Phenothiazines and Benzothiazines Synthesis and Activities (10 papers), Synthesis and Characterization of Heterocyclic Compounds (8 papers) and Quinazolinone synthesis and applications (8 papers). Hiroshi Ohtaka collaborates with scholars based in United States and Japan. Hiroshi Ohtaka's co-authors include Keizo Ito, G. TSUKAMOTO, Toshiro Kanazawa, Takayuki Sukamoto, Masuo Morisaki, Nobuo Ikekawa, Toshihiko Kohno, Takahiro Iwamoto, Hideaki Hara and Tominori Morita and has published in prestigious journals such as Journal of Medicinal Chemistry, The Journal of Organic Chemistry and Chemical and Pharmaceutical Bulletin.

In The Last Decade

Hiroshi Ohtaka

33 papers receiving 368 citations

Peers

Countries citing papers authored by Hiroshi Ohtaka

Since Specialization

Citations

This map shows the geographic impact of Hiroshi Ohtaka's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Hiroshi Ohtaka with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Hiroshi Ohtaka more than expected).

Fields of papers citing papers by Hiroshi Ohtaka

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Hiroshi Ohtaka. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Hiroshi Ohtaka. The network helps show where Hiroshi Ohtaka may publish in the future.

Co-authorship network of co-authors of Hiroshi Ohtaka

This figure shows the co-authorship network connecting the top 25 collaborators of Hiroshi Ohtaka. A scholar is included among the top collaborators of Hiroshi Ohtaka based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Hiroshi Ohtaka. Hiroshi Ohtaka is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

#	Work	Indexed citations
1	Quantitative Structure-Activity Relationship Study of N-(3-Oxo-3,4-dihydro-2H-benzo [1,4]thiazine-6-carbonyl)guanidines as Potent Na/H Exchange Inhibitors. 2000 ·Chemical and Pharmaceutical Bulletin ·Takeshi Yamamoto, (unknown), Ikuo Watanabe, Kengo Harada, Shoji Ikeda, Hiroshi Ohtaka	21
2	Synthesis and Quantitative Structure-Activity Relationships of N-(3-Oxo-3,4-dihydro-2H-benzo[1,4]oxazine-6-carbonyl)guanidines as Na/H Exchange Inhibitors. 1998 ·Chemical and Pharmaceutical Bulletin ·Tomohiro Yamamoto, M Hori, Isao Watanabe, (unknown), Kazuo Harada, Shintaro Ikeda, (unknown), Tadashi Morita, Hiroshi Ohtaka	6
3	A Practical Synthesis of N-(4-Isopropyl-2,2-dimethyl-3-oxo-3,4 dihydro-2H-benzo(1,4)oxazine-6-carbonyl)guanidine Methanesulfonate (KB-R9032) Utilizing Potassium Fluoride-Alumina Catalyzed N-Alkylation. 1998 ·Chemical and Pharmaceutical Bulletin ·Takeshi Yamamoto, (unknown), Ikuo Watanabe, (unknown), Shoji Ikeda, Hiroshi Ohtaka	4
4	Structural Requirements for Potent Na/H Exchange Inhibitors Obtained from Quantitative Structure-Activity Relationships of Monocyclic and Bicyclic Aroylguanidines. 1997 ·Chemical and Pharmaceutical Bulletin ·Takeshi Yamamoto, (unknown), Ikuo Watanabe, (unknown), Kengo Harada, Shoji Ikeda, Hiroshi Ohtaka	6
5	Design and Syntheses of a Series of Novel Serotonin3 Antagonists. 1993 ·Chemical and Pharmaceutical Bulletin ·M Hori, Kenji Suzuki, Takuya Yamamoto, Fumiyuki Nakajima, Akio Ozaki, Hiroshi Ohtaka	8
6	Structural modification patterns from agonists to antagonists and their application to drug design — A new serotonin (5-HT3) antagonist series 1993 ·Birkhäuser Basel eBooks ·Hiroshi Ohtaka, Toshio Fujita	1
7	Structure-Activity Relationship of Flavonoids in Suppressing Rat Liver Lipid Peroxidation 1993 ·YAKUGAKU ZASSHI ·Masanobu Miyahara, Hiroshi Ohtaka, Hajime Katayama, (unknown), Yukinori Miyaichi, Tsuyoshi Tomimori	12
8	Potential nootropic agents, 4-alkoxy-2-(1-piperazinyl)quinazoline derivatives. 1991 ·Chemical and Pharmaceutical Bulletin ·(unknown), (unknown), Hideaki Hara, Takayuki Sukamoto, (unknown), Hiroshi Ohtaka	5
9	Reaction of quinazoline-2,4(1H,3H)-dione with N-substituted cyclic amines in combination with phosphoryl trichloride 1991 ·Journal of the Chemical Society Perkin Transactions 1 ·Kenji Yoshida, Takashi Tanaka, Hiroshi Ohtaka	3
10	Novel 4-substituted 2-piperazinylquinazolines as potent anticonvulsive and antihypoxic agents. 1990 ·Chemical and Pharmaceutical Bulletin ·(unknown), (unknown), Hideaki Hara, (unknown), Takayuki Sukamoto, Hiroshi Ohtaka	24
11	Selective Effect of KB-2796, a New Calcium Entry Blocker, on Cerebral Circulation 1990 ·Journal of Cardiovascular Pharmacology ·Toshiro Kanazawa, Tominori Morita, Kengo Harada, Takahiro Iwamoto, Hiroshi Ohtaka, Takayuki Sukamoto, Keizo Ito, (unknown)	29
12	Novel 4-phenoxy-2-(1-piperazinyl)quinazolines as potent anticonvulsive and antihypoxic agents. 1990 ·Chemical and Pharmaceutical Bulletin ·Mayuko Hori, (unknown), Hideaki Hara, Akio Ozaki, Takayuki Sukamoto, Hiroshi Ohtaka	33
13	Bioisosteric transformation of H1-antihistaminic benzimidazole derivatives. 1989 ·Chemical and Pharmaceutical Bulletin ·(unknown), (unknown), (unknown), Hiroshi Ohtaka	15
14	Syntheses of the metabolites of 1-(2-ethoxyethyl)-2-(hexahydro-4-methyl-1H-1,4-diazepin-1-yl)-1H-benzimidazole difumarate (KG-2413) and related compounds. 1989 ·Chemical and Pharmaceutical Bulletin ·(unknown), (unknown), Hiroshi Ohtaka	13
15	Benzylpiperazine derivatives. XI. Synthesis of compounds related to the metabolites of 1-(bis(4-fluorophenyl)methyl)-4-(2,3,4-trimethoxybenzyl)piperazine dihydrochloride (KB-2796). 1989 ·Chemical and Pharmaceutical Bulletin ·Hiroshi Ohtaka, (unknown), (unknown), (unknown)	5
16	Effects of KB-2796, a New Calcium Antagonist, and Other Diphenylpiperazines on [3H]Nitrendipine Binding 1988 ·The Japanese Journal of Pharmacology ·Takahiro Iwamoto, Tominori Morita, Toshiro Kanazawa, Hiroshi Ohtaka, Keizo Ito	33
17	Benzylpiperazine derivatives. IX. Structure-antiulcer activity studies of 1-(aminocarbonylalkyl)-4-benzylpiperazine derivatives by the adaptive least-squares method. 1988 ·Chemical and Pharmaceutical Bulletin ·Hiroshi Ohtaka, Kenji Yoshida, Kenji Suzuki	1
18	SYNTHESIS AND STRUCTURE-ACTIVITY RELATIONSHIPS OF BENZYLPIPERAZINE DERIVATIVES AS POTENTIAL CEREBRAL VASODILATORS 1987 ·Journal of Pharmacobio-Dynamics ·Hiroshi Ohtaka, Toshiro Kanazawa, Keizo Ito, G. TSUKAMOTO	1
19	Benzylpiperazine derivatives. VI. Design and syntheses of vinylogs of 1-benzyl-4-diphenylmethylpiperazine derivatives and their cerebral vasodilating activities. 1987 ·Chemical and Pharmaceutical Bulletin ·Hiroshi Ohtaka, Toshiro Kanazawa, Keizo Ito, G. TSUKAMOTO	3
20	Fucosterol-24,28-epoxide, as a probable intermediate in the conversion of β-sitosterol to cholesterol in the silkworm 1972 ·Journal of the Chemical Society Chemical Communications ·Masuo Morisaki, Hiroshi Ohtaka, (unknown), Nobuo Ikekawa, Yasuhiro Horie, (unknown)	24

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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