Masahiro Hirama

11.5k total citations
331 papers, 9.2k citations indexed

About

Masahiro Hirama is a scholar working on Organic Chemistry, Molecular Biology and Environmental Chemistry. According to data from OpenAlex, Masahiro Hirama has authored 331 papers receiving a total of 9.2k indexed citations (citations by other indexed papers that have themselves been cited), including 247 papers in Organic Chemistry, 109 papers in Molecular Biology and 96 papers in Environmental Chemistry. Recurrent topics in Masahiro Hirama's work include Marine Toxins and Detection Methods (96 papers), Synthetic Organic Chemistry Methods (95 papers) and Cyclization and Aryne Chemistry (59 papers). Masahiro Hirama is often cited by papers focused on Marine Toxins and Detection Methods (96 papers), Synthetic Organic Chemistry Methods (95 papers) and Cyclization and Aryne Chemistry (59 papers). Masahiro Hirama collaborates with scholars based in Japan, Spain and United States. Masahiro Hirama's co-authors include Masayuki Inoue, Tohru Oishi, Masahiko Yamaguchi, Hiroki Oguri, Tai Shiraishi, Shô Itô, Shuji Yamashita, Hisatoshi Uehara, Masahiko Yamaguchi and Megumi Maruyama and has published in prestigious journals such as Science, Proceedings of the National Academy of Sciences and Journal of the American Chemical Society.

In The Last Decade

Masahiro Hirama

327 papers receiving 8.9k citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Masahiro Hirama Japan 50 6.9k 2.7k 2.4k 1.3k 813 331 9.2k
Minoru Isobe Japan 48 5.8k 0.8× 4.3k 1.6× 1.7k 0.7× 1.3k 1.0× 915 1.1× 421 10.2k
Yoshito Kishi United States 64 10.4k 1.5× 5.4k 2.0× 1.6k 0.7× 2.4k 1.9× 2.4k 3.0× 346 15.2k
K. C. Nicolaou United States 62 9.8k 1.4× 3.5k 1.3× 844 0.4× 1.3k 1.0× 2.1k 2.6× 224 12.6k
Kazuo Tachibana Japan 39 2.7k 0.4× 2.2k 0.8× 2.3k 1.0× 1.5k 1.1× 884 1.1× 145 5.2k
Donna Van Engen United States 30 2.2k 0.3× 1.3k 0.5× 673 0.3× 545 0.4× 328 0.4× 74 4.0k
Hiroki Oguri Japan 31 1.8k 0.3× 1.2k 0.5× 706 0.3× 613 0.5× 951 1.2× 105 3.2k
Jun’ichi Kobayashi Japan 52 5.8k 0.8× 3.2k 1.2× 998 0.4× 5.0k 3.9× 3.1k 3.8× 344 10.4k
Tohru Oishi Japan 31 1.9k 0.3× 1.2k 0.4× 1.2k 0.5× 607 0.5× 319 0.4× 141 3.2k
Hideshi Nakamura Japan 38 1.8k 0.3× 1.7k 0.6× 758 0.3× 1.6k 1.2× 987 1.2× 120 4.4k
Kiyoyuki Yamada Japan 39 2.2k 0.3× 2.8k 1.0× 597 0.3× 1.2k 0.9× 1.1k 1.3× 223 5.5k

Countries citing papers authored by Masahiro Hirama

Since Specialization
Citations

This map shows the geographic impact of Masahiro Hirama'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 Masahiro Hirama with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Masahiro Hirama more than expected).

Fields of papers citing papers by Masahiro Hirama

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Masahiro Hirama. 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 Masahiro Hirama. The network helps show where Masahiro Hirama may publish in the future.

Co-authorship network of co-authors of Masahiro Hirama

This figure shows the co-authorship network connecting the top 25 collaborators of Masahiro Hirama. A scholar is included among the top collaborators of Masahiro Hirama 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 Masahiro Hirama. Masahiro Hirama is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Tsumuraya, Takeshi, et al.. (2025). Analysis of ciguatoxins in fish with a single-step sandwich immunoassay. Harmful Algae. 146. 102869–102869.
2.
Tsumuraya, Takeshi, et al.. (2024). Humanization and characterization of an anti-ciguatoxin CTX3C monoclonal antibody. Toxicon. 247. 107848–107848. 1 indexed citations
3.
Yamashita, Shuji, et al.. (2014). Practical Route to the Left Wing of CTX1B and Total Syntheses of CTX1B and 54‐deoxyCTX1B. Chemistry - A European Journal. 21(6). 2621–2628. 12 indexed citations
4.
Yamashita, Shuji & Masahiro Hirama. (2013). Total Synthesis of Cortistatin A and J. Journal of Synthetic Organic Chemistry Japan. 71(8). 768–778. 1 indexed citations
5.
6.
Oshiro, Naomasa, et al.. (2011). Detailed LC-MS/MS Analysis of Ciguatoxins Revealing Distinct Regional and Species Characteristics in Fish and Causative Alga from the Pacific. Analytical Chemistry. 83(23). 8886–8891. 149 indexed citations
7.
Tanaka, Yoshikazu, Takeshi Tsumuraya, Ikuo Fujii, et al.. (2010). Structural and energetic hot-spots for the interaction between a ladder-like polycyclic ether and the anti-ciguatoxin antibody 10C9Fab. Molecular BioSystems. 7(3). 793–798. 2 indexed citations
8.
Hirama, Masahiro, et al.. (2010). Stereoselective Synthesis of Caribbean Ciguatoxin M-Ring Using [2+2] Photocyclization. Heterocycles. 82(1). 761–761. 7 indexed citations
9.
Koyama, Yasuhito, et al.. (2008). Total Synthesis of a Protected Aglycon of the Kedarcidin Chromophore. Angewandte Chemie International Edition. 48(6). 1110–1113. 23 indexed citations
10.
Hirama, Masahiro, et al.. (2008). A concise route to the C2-symmetric tricyclic skeleton of ryanodine. Tetrahedron Letters. 50(9). 1035–1037. 19 indexed citations
11.
Inoue, Masayuki, et al.. (2008). A Simple Desymmetrization Approach to the Spiroxin Framework. Heterocycles. 76(2). 1011–1011. 17 indexed citations
12.
Inoue, Masayuki, Keisuke Miyazaki, Yuuki Ishihara, et al.. (2006). Total Synthesis of Ciguatoxin and 51-HydroxyCTX3C. Journal of the American Chemical Society. 128(29). 9352–9354. 76 indexed citations
13.
Inoue, Masayuki, Takaaki Sato, & Masahiro Hirama. (2003). Total Synthesis of Merrilactone A. Journal of the American Chemical Society. 125(36). 10772–10773. 88 indexed citations
14.
Oishi, Tohru, et al.. (2001). Highly Stereocontrolled Synthesis of the ABCD Ring Fragment of Ciguatoxin CTX3C. Synlett. 2001(Special Issue). 952–954. 19 indexed citations
15.
Sato, Itaru, et al.. (1999). Synthetic Study of C-1027 Chromophore. Highly Stereoselective Glycosylation. Chemistry Letters. 28(9). 867–868. 9 indexed citations
16.
Satake, Masayuki, Akio Morohashi, Hiroki Oguri, et al.. (1998). ChemInform Abstract: The Absolute Configuration of Ciguatoxin.. ChemInform. 29(10). 1 indexed citations
17.
Hirama, Masahiro, et al.. (1998). Evidence for Spontaneous Cycloaromatization of Nine-Membered Monocyclic Enediyne. Chemistry Letters. 27(9). 959–960. 12 indexed citations
18.
Akiyama, Eiji & Masahiro Hirama. (1996). Total Synthesis and Absolute Configuration of (-)-Sedacryptine. Synlett. 1996(1). 100–102. 16 indexed citations
19.
Hayashi, Akio, Masahiko Yamaguchi, & Masahiro Hirama. (1995). α-Alkenylation of Ketones with 1-Alkynes. Synlett. 1995(1). 51–52. 6 indexed citations
20.
Hirama, Masahiro, et al.. (1986). Trifunctional Chiral Synthons via Stereocontrolled Yeast Reduction. Preparation of Chiral Pentane-1,3,5-triol Derivatives. Chemistry Letters. 15(8). 1381–1384. 7 indexed citations

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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