Br[CH2:2][C:3]1[O:4][C:5](=[O:10])[O:6][C:7]=1[CH2:8][Br:9].[CH3:11][O:12][CH2:13][CH2:14][O:15][CH2:16][C:17]([OH:19])=[O:18].C(=O)([O-])[O-].[K+].[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:19][C:17](=[O:18])[CH2:16][O:15][CH2:14][CH2:13][O:12][CH3:11]4,5-Dibromomethyl-2-oxo-1,3-dioxolene (136 mg, 0.50 mmol) was dissolved in acetonitrile (5.0 mL). Thereto were added 2-methoxyethoxyacetic acid (0.057 mL, 0.50 mmol) and potassium carbonate (69 mg, 0.50 mmol) This mixture was stirred at 25° C. for 30 minutes. After the ordinary post-treatment, the reaction product was purified by thin-layer chromatography (developed with chloroform) to obtain Compound S-32 (45 mg, yield 28%).
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