Br[CH2:2][C:3]1[O:4][C:5](=[O:10])[O:6][C:7]=1[CH2:8][Br:9].[CH:11]([O-:13])=[O:12].[K+]>C(#N)C>[Br:9][CH2:8][C:7]1[O:6][C:5](=[O:10])[O:4][C:3]=1[CH2:2][O:13][CH:11]=[O:12]4,5-Dibromomethyl-2-oxo-1,3-dioxolene (150 mg, 0.55 mmol) was dissolved in acetonitrile (4.0 mL). Potassium formate (46 mg, 0.55 mmol) was added thereto. This mixture was stirred at 25° C. for 5 hours. Through the ordinary post-treatment, crude Compound S-30 (85 mg, yield 65%) was obtained.
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