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2-Naphthylmethyl Protecting Group Strategy for Streamlined Synthesis of a Fondaparinux Analogue
Zhenghao Wu1, Xiao Liu1, Deqian Li1
1School of Pharmaceutical Sciences, Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou570288, China.
Organic Letters
|August 14, 2026
Summary
Synthesizing fondaparinux is complex. A new 2-naphthylmethyl protecting group strategy simplifies the process, yielding an analogue with comparable anti-FXa activity to fondaparinux.
Area of Science:
- Medicinal Chemistry
- Organic Synthesis
- Drug Discovery
Background:
- Fondaparinux synthesis presents significant challenges in stereochemical control, protecting group strategies, and purification.
- Highly functionalized intermediates in fondaparinux synthesis require complex manipulation and purification methods.
Purpose of the Study:
- To develop a more efficient synthesis strategy for fondaparinux analogues.
- To explore the utility of a 2-naphthylmethyl (Nap) protecting group in fondaparinux synthesis.
- To evaluate the anti-Factor Xa (anti-FXa) activity of a novel fondaparinux analogue.
Main Methods:
- Utilized a 2-naphthylmethyl (Nap) protecting group strategy for an azide-functionalized fondaparinux analogue.
- Employed direct C-2 Nap installation and C-6 2-(diphenylphosphinoyl)acetyl (DPPA)-assisted β-glucosylation for streamlined assembly.
- Leveraged Nap-mediated phase behavior to facilitate the isolation of intermediates without chromatography.
Main Results:
- Successfully synthesized a fondaparinux analogue using the novel protecting group strategy.
- Streamlined the synthetic assembly through efficient C-2 Nap installation and DPPA-assisted β-glucosylation.
- Isolated 17 out of 20 intermediates without the need for chromatography, demonstrating purification advantages.
- The final fondaparinux analogue exhibited anti-FXa activity comparable to commercial fondaparinux.
Conclusions:
- The 2-naphthylmethyl (Nap) protecting group strategy offers a simplified and efficient approach to fondaparinux analogue synthesis.
- Nap-mediated phase behavior significantly reduces the reliance on chromatographic purification for intermediates.
- The developed analogue represents a promising candidate with potent anti-FXa activity, comparable to existing therapies.
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