[CH2:1]([O:8][C:9]1[C:16]([O:17][CH3:18])=[CH:15][C:12]([CH:13]=[O:14])=[C:11]([I:19])[CH:10]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.CS(C)=[O:22].S(=O)(=O)(O)O.Cl([O-])=O.[Na+]>O.C(#N)C>[CH2:1]([O:8][C:9]1[C:16]([O:17][CH3:18])=[CH:15][C:12]([C:13]([OH:22])=[O:14])=[C:11]([I:19])[CH:10]=1)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1A mixture of 4-benzyloxy-2-iodo-5-methoxybenzaldehyde (reference example 1-1) (20 g), dimethylsulfoxide (19 mL), concentrated sulfuric acid (3 mL), water (30 mL) and acetonitrile (181 mL) was added a mixture of sodium chlorite (9.8 g) and water (30 mL). After stirring at room temperature for 30 minutes, water was added to the mixture. Insoluble materials were collected by filtration to give the title compound (20.3 g).
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