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B. ChemExpress's Approach
((2R,7aS)-2-Fluorotetrahydro-1H-pyrrolizin-7a(5H)-yl)methanol
(WO_2024092420_A1. International Filing Date: 2022-10-31)

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? 4-Step diastereoselective synthesis ¡¤ High ee value

? The TMS ether was isolated and directly used for the fluorination

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