Gemcitabine → 4-amino-1-((6aR,8R,9aR)-9,9-difluoro-2,2,4,4-tetraisopropyltetrahydro-6H-furo[3,2-f][1,3,5,2,4]trioxadisilocin-8-yl)pyrimidin-2(1H)-one

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As shown above, Gemcitabine (4-amino-1-((2R,4R,5R)-3,3-difluoro-4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)pyrimidin-2(1H)-one) can be treated with 1,3-dichloro-1,1,3,3-tetraisopropyldisiloxane (TIPDSiCl2) in dry pyridine to provide 4-amino-1-((6aR,8R,9aR)-9,9-difluoro-2,2,4,4-tetraisopropyltetrahydro-6H-furo[3,2-f][1,3,5,2,4]trioxadisilocin-8-yl)pyrimidin-2(1H)-one. It is contemplated that other 1,3-dihalo-1,1,3,3-tetraalkyldisiloxanes can be used in place of TIPDSiCl2. It is also contemplated that two monofunctional halosiloxane protecting groups can be used in place of the difunctional TIPDSiCl2. Further, it is also contemplated that other hydroxyl protecting groups (e.g., tetrahydropyranyl (THP) or acetyl (Ac)) can be used in place of TIPDSiCl2.

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