Seiji Niwa

2.1k total citations · 1 hit paper
23 papers, 1.7k citations indexed

About

Seiji Niwa is a scholar working on Organic Chemistry, Molecular Biology and Spectroscopy. According to data from OpenAlex, Seiji Niwa has authored 23 papers receiving a total of 1.7k indexed citations (citations by other indexed papers that have themselves been cited), including 21 papers in Organic Chemistry, 6 papers in Molecular Biology and 6 papers in Spectroscopy. Recurrent topics in Seiji Niwa's work include Asymmetric Synthesis and Catalysis (18 papers), Chemical synthesis and alkaloids (7 papers) and Analytical Chemistry and Chromatography (6 papers). Seiji Niwa is often cited by papers focused on Asymmetric Synthesis and Catalysis (18 papers), Chemical synthesis and alkaloids (7 papers) and Analytical Chemistry and Chromatography (6 papers). Seiji Niwa collaborates with scholars based in Japan. Seiji Niwa's co-authors include Kenso Soai, Hiroshi Hori, Masami Watanabe, Yasuyuki Yamada, Hideo Inoue, Masami Watanabe, Shin‐ichi Fujita, Akira Takahara, Toshihiro Hatanaka and Tomoko Takeda and has published in prestigious journals such as Chemical Reviews, The Journal of Organic Chemistry and Tetrahedron Letters.

In The Last Decade

Seiji Niwa

22 papers receiving 1.6k citations

Hit Papers

Enantioselective addition of organozinc reagents to aldeh... 1992 2026 2003 2014 1992 250 500 750 1000
What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

  1. Enantioselective addition of organozinc reagents to aldehydes
    1992 1.1k citations Kenso Soai, Seiji Niwa Chemical Reviews profile →

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Seiji Niwa Japan 14 1.5k 618 513 349 149 23 1.7k
Odile Samuel France 20 2.0k 1.3× 762 1.2× 523 1.0× 386 1.1× 170 1.1× 36 2.4k
Tummanapalli Satyanarayana India 11 2.3k 1.6× 440 0.7× 647 1.3× 219 0.6× 89 0.6× 21 2.5k
Claude Agami France 24 1.9k 1.3× 366 0.6× 693 1.4× 278 0.8× 93 0.6× 117 2.1k
Tatsunobu Sumiya Japan 13 2.0k 1.3× 529 0.9× 601 1.2× 119 0.3× 19 0.1× 17 2.1k
Yannick Vallée France 24 1.5k 1.0× 169 0.3× 432 0.8× 150 0.4× 68 0.5× 97 1.7k
Ulrich Eder Australia 14 1.4k 0.9× 317 0.5× 614 1.2× 161 0.5× 19 0.1× 42 1.6k
Karel M. J. Brands United States 18 827 0.6× 211 0.3× 294 0.6× 106 0.3× 28 0.2× 43 1.1k
Alessia Millemaggi United Kingdom 9 893 0.6× 124 0.2× 367 0.7× 208 0.6× 440 3.0× 11 1.5k
Choji Kashima Japan 20 1.4k 1.0× 94 0.2× 431 0.8× 166 0.5× 22 0.1× 212 1.7k
H. Pracejus Germany 18 778 0.5× 342 0.6× 249 0.5× 179 0.5× 22 0.1× 52 957

Countries citing papers authored by Seiji Niwa

Since Specialization
Citations

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

Fields of papers citing papers by Seiji Niwa

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Seiji Niwa

This figure shows the co-authorship network connecting the top 25 collaborators of Seiji Niwa. A scholar is included among the top collaborators of Seiji Niwa 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 Seiji Niwa. Seiji Niwa 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.
Yamamoto, Takashi, Seiji Niwa, Tomoyuki Onishi, et al.. (2012). Discovery and evaluation of selective N-type calcium channel blockers: 6-Unsubstituted-1,4-dihydropyridine-5-carboxylic acid derivatives. Bioorganic & Medicinal Chemistry Letters. 22(11). 3639–3642. 11 indexed citations
2.
Yamamoto, Takashi, Seiji Niwa, Tomoyuki Onishi, et al.. (2008). The structure–activity relationship study on 2-, 5-, and 6-position of the water soluble 1,4-dihydropyridine derivatives blocking N-type calcium channels. Bioorganic & Medicinal Chemistry Letters. 18(17). 4813–4816. 14 indexed citations
3.
Yamamoto, Takashi, Seiji Niwa, Satoshi Iwayama, et al.. (2006). Discovery, structure–activity relationship study, and oral analgesic efficacy of cyproheptadine derivatives possessing N-type calcium channel inhibitory activity. Bioorganic & Medicinal Chemistry. 14(15). 5333–5339. 21 indexed citations
4.
Yamamoto, Takashi, Seiji Niwa, Tomoyuki Onishi, et al.. (2005). Structure–activity relationship study of 1,4-dihydropyridine derivatives blocking N-type calcium channels. Bioorganic & Medicinal Chemistry Letters. 16(4). 798–802. 29 indexed citations
5.
Soai, Kenso & Seiji Niwa. (1992). Enantioselective addition of organozinc reagents to aldehydes. Chemical Reviews. 92(5). 833–856. 1120 indexed citations breakdown →
6.
Soai, Kenso, et al.. (1992). Asymmetric synthesis of optically active fluorine-containing alcohols using chiral catalysts. Journal of Fluorine Chemistry. 59(1). 5–8. 6 indexed citations
7.
Niwa, Seiji & Kenso Soai. (1991). Asymmetric synthesis using chiral piperazines. Part 3. Enantioselective addition of dialkylzincs to aryl aldehydes catalysed by chiral piperazines. Journal of the Chemical Society Perkin Transactions 1. 2717–2717. 46 indexed citations
8.
Niwa, Seiji, Toshihiro Hatanaka, & Kenso Soai. (1991). Asymmetric synthesis of optically active alcohols with two chiral centres from a racemic aldehyde by the selective addition of dialkylzinc reagents using chiral catalysts. Journal of the Chemical Society Perkin Transactions 1. 2025–2025. 7 indexed citations
9.
Soai, Kenso, Seiji Niwa, & Hiroshi Hori. (1990). Asymmetric self-catalytic reaction. Self-production of chiral 1-(3-pyridyl)alkanols as chiral self-catalysts in the enantioselective addition of dialkylzinc reagents to pyridine-3-carbaldehyde. Journal of the Chemical Society Chemical Communications. 982–982. 113 indexed citations
10.
Soai, Kenso, Seiji Niwa, & Toshihiro Hatanaka. (1990). Highly Diastereoselective 1,2-Asymmetric Addition of Dialkylzincs to Chiral 2-Phenylpropanal Catalyzed by Amino Alcohol. Bulletin of the Chemical Society of Japan. 63(7). 2129–2130. 2 indexed citations
11.
Niwa, Seiji & Kenso Soai. (1990). Catalytic asymmetric synthesis of optically active alkynyl alcohols by enantioselective alkynylation of aldehydes and by enantioselective alkylation of alkynyl aldehydes. Journal of the Chemical Society Perkin Transactions 1. 937–937. 102 indexed citations
12.
13.
Soai, Kenso & Seiji Niwa. (1989). Catalytic Asymmetric Synthesis of Optically Active Alkynyl Alcohols. Chemistry Letters. 18(3). 481–484. 14 indexed citations
14.
Soai, Kenso, Hiroshi Hori, & Seiji Niwa. (1989). Enantioselective Addition of Dialkylzincs to Pyridinecarbaldehyde in the Presence of Chiral Aminoalcohols: Asymmetric Synthesis of Pyridylalkyl Alcohols. Heterocycles. 29(11). 2065–2065. 27 indexed citations
15.
Soai, Kenso, Seiji Niwa, & Masami Watanabe. (1989). Polymer-bound N-alkylnorephedrines as efficient chiral catalysts for the enantioselective addition of dialkylzincs to both aromatic and aliphatic aldehydes. Journal of the Chemical Society Perkin Transactions 1. 109–109. 34 indexed citations
16.
Soai, Kenso, et al.. (1989). Catalytic Asymmetric Synthesis of 2- and 3-Furylcarbinols. Heterocycles. 29(11). 2219–2219. 12 indexed citations
17.
Soai, Kenso, Seiji Niwa, & Masami Watanabe. (1988). Polymer-bound ephedrine as an efficient chiral catalyst for the enantioselective addition of dialkylzincs to aldehydes. The Journal of Organic Chemistry. 53(4). 927–928. 74 indexed citations
18.
Soai, Kenso, et al.. (1987). Asymmetric synthesis of pyridylethanols and amino alcohols by enantioselective reduction with lithium borohydride modified with N,N′-dibenzoylcystine. Journal of the Chemical Society Chemical Communications. 801–802. 13 indexed citations
19.
Soai, Kenso, Seiji Niwa, Yasuyuki Yamada, & Hideo Inoue. (1987). Chiral piperazine as a new chiral catalyst for the enantioselective addition of dialkyl zincs to aryl aldehydes. Tetrahedron Letters. 28(41). 4841–4842. 53 indexed citations
20.
IMAI, Sumi, et al.. (1980). ChemInform Abstract: ASYMMETRIC HYDROGENATION OF α‐KETO ESTERS USING A PLATINUM‐ALUMINA CATALYST MODIFIED WITH CINCHONA ALKALOID. Chemischer Informationsdienst. 11(32). 6 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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