B(Cl)(Cl)Cl.[NH2:5][C:6]1[CH:11]=[CH:10][N:9]([CH:12]2[C@@H:16]([F:17])[C@H:15]([O:18]CC3C=CC(Cl)=CC=3)[C@@H:14]([CH2:27][O:28]CC3C=CC(Cl)=CC=3)[S:13]2)[C:8](=[O:37])[N:7]=1.CO>C(Cl)Cl>[NH2:5][C:6]1[CH:11]=[CH:10][N:9]([CH:12]2[S:13][C@H:14]([CH2:27][OH:28])[C@@H:15]([OH:18])[C@@H:16]2[F:17])[C:8](=[O:37])[N:7]=1In a nitrogen atmosphere, 6.8 mL of a methylene chloride solution of 1 mol/L boron trichloride was added to a solution of 0.17 g of (3S,4S,5R)-2-(4-amino-2-oxo-1,2-dihydropyrimidin-1-yl)-4-((4-chlorobenzyl)oxy)-5-(((4-chlorobenzyl)oxy)methyl)-3-fluorothiolane in 11 mL of methylene chloride under cooling on dry ice/acetone, and the obtained mixture was then stirred at the same temperature as described above for 3.5 hours. Thereafter, the temperature of the reaction mixture was increased to 0° C., and the reaction mixture was then stirred for 30 minutes. Thereafter, 7.5 mL of methanol was added to the reaction mixture, and the thus obtained mixture was then stirred at room temperature for 30 minutes. Thereafter, a solid was collected by filtration, and it was successively washed with ethyl acetate and hexane. The obtained solid was purified by silica gel column chromatography (chloroform/methanol=100/0 to 60/40), so as to obtain 63 mg of (2R,3S,4S)-5-(4-amino-2-oxo-1,2-dihydropyrimidin-1-yl)-4-fluoro-2-(hydroxymethyl)thiolan-3-ol in the form of a white solid.
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