Evidence map›Paper›PMID 39979412›Full record

ArticleNature chemistry2025

Catalytic difluorocarbene insertion enables access to fluorinated oxetane isosteres.

Tong-De Tan, Fang Zhou, Kevin P Quirion, Yu-Qi Wang, Daniel Zhi Wei Ng, Xiaohua Luo, Eric Chun Yong Chan, Peng Liu, Ming Joo Koh

Abstract read
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In one paragraph

Article in Nature chemistry, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.

0numbers the graph read from it
0cells of the map it votes in
9citing 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

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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

9 citing papers in PubMed.

  1. Article
  2. Article
  3. Article
  4. Article
  5. Article
  6. Flow-Enabled, Modular Access to α,α-Difluoromethylene Amines.Angewandte Chemie (International ed. in English) · 2025
    Article
  7. Article
  8. Article
  9. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors.

Tong-De Tan *Department of Chemistry, National University of Singapore, Singapore, Singapore.
Fang Zhou *Department of Chemistry, National University of Singapore, Singapore, Singapore.
Kevin P QuirionDepartment of Chemistry, University of Pittsburgh, Pittsburgh, PA, USA.ORCID http://orcid.org/0000-0002-1599-9422
Yu-Qi WangDepartment of Chemistry, National University of Singapore, Singapore, Singapore.
Daniel Zhi Wei NgDepartment of Pharmacy and Pharmaceutical Sciences, National University of Singapore, Singapore, Singapore.ORCID http://orcid.org/0009-0009-4999-4492
Xiaohua LuoDepartment of Chemistry, National University of Singapore, Singapore, Singapore.
Eric Chun Yong ChanDepartment of Pharmacy and Pharmaceutical Sciences, National University of Singapore, Singapore, Singapore. phaccye@nus.edu.sg.ORCID http://orcid.org/0000-0001-6107-9072
Peng LiuDepartment of Chemistry, University of Pittsburgh, Pittsburgh, PA, USA. pengliu@pitt.edu.ORCID http://orcid.org/0000-0002-8188-632X
Ming Joo KohDepartment of Chemistry, National University of Singapore, Singapore, Singapore. chmkmj@nus.edu.sg.ORCID http://orcid.org/0000-0002-2534-4921

Funding

Ministry of Education - Singapore (MOE) A-8001693-00-00National Science Foundation (NSF) CHE-2247505National Science Foundation (NSF) OAC-1928147National Science Foundation (NSF) OAC-1928224National Science Foundation (NSF) OAC-2117681
6 · The paper itself

Abstract

Skeletal editing of heterocyclic building blocks offers an appealing way to expand the accessible chemical space by diversifying molecular scaffolds for drug discovery. Despite the recent boom in this area, catalytic strategies that directly introduce fluorine into the backbone of small-ring heterocycles remain rare owing to the challenges of strain-induced ring cleavage and defluorination. Here we describe a copper-catalysed approach for skeletal expansion of oxygen heterocycles by reaction with a difluorocarbene species generated in situ to induce carbon atom insertion. The α,α-difluoro-oxetane products are potential surrogates of oxetane, β-lactone and carbonyl pharmacophores on the basis of their computed molecular properties and electrostatic potential maps. The utility of this approach is highlighted by synthesis of various drug-like molecules and fluorinated isosteres of biologically active compounds. Experimental and computational investigations provide insight into the mechanism and the unique role of the copper catalyst in promoting both ring-opening and cyclization steps of the reaction.

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Registered trials

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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.