Ahmed Sabri Gabr

Dr. Ahmed Sabri Gabr

Organic Chemistry, Osaka University, Ōsaka, Japan
orcid
Specially Appointed Assistant Professor, Department of Chemi...

Research Focus & Metrics

Academic Career Length

5Years (2022-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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8 February 2022 in Journal of Molecular Structure
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Journal Article
Closed access
NMNadia Hanafy Metwally
Nadia Hanafy Metwally
Ahmed Sabri GabrAhmed Sabri Gabr
Ahmed Sabri Gabr

19 December 2022 in Molecules
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Journal Article
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Mohamed S. H. SalemMohamed S. H. Salem
Mohamed S. H. Salem
Ahmed Sabri GabrAhmed Sabri Gabr
Ahmed Sabri Gabr
Md. Imrul KhalidMd. Imrul Khalid
Md. Imrul Khalid
HSHiroaki Sasai
Hiroaki Sasai
STShinobu Takizawa
Shinobu Takizawa
A novel double aza-oxa[7]helicene was synthesized from the commercially available N1,N4-di(naphthalen-2-yl)benzene-1,4-diamine and p-benzoquinone in two steps. Combining the acid-mediated annulation with the electrochemical sequential reaction (oxidative coupling and dehydrative cyclization) afforded this double hetero[7]helicene. Moreover, the structural and optical features of this molecule have been studied using X-ray crystallographic analysis, and the absorption and emission behaviors were rationalized based on DFT calculations.

1 July 2025 in Nature Communications
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Journal Article
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Ahmed Sabri GabrAhmed Sabri Gabr
Ahmed Sabri Gabr
Mohamed S. H. SalemMohamed S. H. Salem
Mohamed S. H. Salem
IKImrul Khalid
Imrul Khalid
RTRyota Takahashi
Ryota Takahashi
YNYoshihiro Nishimoto
Yoshihiro Nishimoto
STShinobu Takizawa
Shinobu Takizawa
The chemistry of hetero[8]circulenes has been limited to three main types, constrained by synthetic challenges in creating unsymmetrical variants. Herein, we introduce an electrochemical approach to a type of hetero[8]circulene, featuring five hexagons and three pentagons. Our method capitalizes on the sustainability and selectivity of electrochemistry, utilizing differential oxidation potentials to generate dioxaza[8]circulenes through selective intermolecular and intramolecular couplings under mild conditions, achieving yields of up to 83% with good functional group tolerance. We further refine this process into a one-pot protocol using commercially available substrates, forming six new bonds. Comprehensive structural, optical, and electrochemical characterizations, including X-ray crystallography, spectrophotometric analysis, and DFT calculations, are conducted. Inspired by their distinct structural and redox properties, we explore the application of dioxaza[8]circulenes as organophotocatalysts for diverse C–X (X = C, B, S, P) bond formation achieving up to 97% yields under LED light irradiation (365 nm) without transition metals.

1 January 2023 in Molecules
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Journal Article
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DFDuona Fan
Duona Fan
Ahmed Sabri GabrAhmed Sabri Gabr
Ahmed Sabri Gabr
HSHiroaki Sasai
Hiroaki Sasai
STShinobu Takizawa
Shinobu Takizawa
This study processes a facile and green approach for the Markovnikov-selective hydroamination of styrene with naphthylamine through irradiation with UV LED light (365 nm) via an electron donor–acceptor complexation between naphthylamines and oxygen in situ. This protocol showcases the synthetic potential for aerobic C–N bond formation without using a metal catalyst and photosensitizer. Three naphthylamines were examined and afforded desired C–N bond formation product in moderate yield.