Evidence map›Paper›PMID 25301624›Full record

ArticleScience (New York, N.Y.)2014

Asymmetric syntheses of sceptrin and massadine and evidence for biosynthetic enantiodivergence.

Zhiqiang Ma, Xiaolei Wang, Xiao Wang, Rodrigo A Rodriguez, Curtis E Moore, Shuanhu Gao, Xianghui Tan, Yuyong Ma, Arnold L Rheingold, Phil S Baran and 1 more

Abstract read
In one paragraph

Article in Science (New York, N.Y.), 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 39 papers.

0numbers the graph read from it
0cells of the map it votes in
39citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

39 citing papers in PubMed.

  1. An Alkaloid Biosynthetic Gene Bundle in Animals.Journal of the American Chemical Society · 2026
    Article
  2. Article
  3. Review
  4. Article
  5. 10th anniversary of discovering cGAMP: synthesis and beyond.Organic chemistry frontiers : an international journal of organic chemistry · 2023
    Article
  6. Review
  7. Article
  8. Review
  9. Article
  10. Marine Pyrrole Alkaloids.Marine drugs · 2021
    Review
  11. Article
  12. Article
  13. Review
  14. Total Synthesis of (±)-Sceptrin.Organic letters · 2020
    Article
  15. Article
  16. Article
  17. Article
  18. Article
  19. Article
  20. Article
4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

11 authors.

Zhiqiang MaDepartment of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
Xiaolei WangDepartment of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
Xiao WangDepartment of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
Rodrigo A RodriguezDepartment of Chemistry, The Scripps Research Institute, La Jolla, CA 92037, USA.
Curtis E MooreDepartment of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093, USA.
Shuanhu GaoDepartment of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
Xianghui TanDepartment of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
Yuyong MaDepartment of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
Arnold L RheingoldDepartment of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093, USA.
Phil S BaranDepartment of Chemistry, The Scripps Research Institute, La Jolla, CA 92037, USA.
Chuo ChenDepartment of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA. chuo.chen@utsouthwestern.edu.

Funding

Synthesis of Pyrrole-Imidazole AlkaloidsR01GM073949 · NIGMS · SCRIPPS RESEARCH INSTITUTE, THE · PI BARAN, PHIL S · 2005 to 2015
$4.0M
Asymmetric Synthesis of Biologically Active Marine Natural ProductsR01GM079554 · NIGMS · UT SOUTHWESTERN MEDICAL CENTER · PI CHEN, CHUO · 2007 to 2016
$2.9M
NIGMS NIH HHS R01 GM073949NIGMS NIH HHS R01-GM073949NIGMS NIH HHS R01 GM079554NIGMS NIH HHS R01-GM079554
6 · The paper itself

Abstract

Cycloaddition is an essential tool in chemical synthesis. Instead of using light or heat as a driving force, marine sponges promote cycloaddition with a more versatile but poorly understood mechanism in producing pyrrole-imidazole alkaloids sceptrin, massadine, and ageliferin. Through de novo synthesis of sceptrin and massadine, we show that sponges may use single-electron oxidation as a central mechanism to promote three different types of cycloaddition. Additionally, we provide surprising evidence that, in contrast to previous reports, sceptrin, massadine, and ageliferin have mismatched chirality. Therefore, massadine cannot be an oxidative rearrangement product of sceptrin or ageliferin, as is commonly believed. Taken together, our results demonstrate unconventional chemical approaches to achieving cycloaddition reactions in synthesis and uncover enantiodivergence as a new biosynthetic paradigm for natural products.

Indexed as

Cycloaddition ReactionAnimalsBiosynthetic PathwaysMolecular StructurePoriferaPyrrolesStereoisomerismmassadinePyrrolessceptrin

Identifiers

PMID25301624
PMCPMC4205478

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.