II.[CH2:3]([O:10][C:11]1[CH:18]=[CH:17][C:14]([CH:15]=O)=[C:13]([N+:19]([O-:21])=[O:20])[C:12]=1[O:22][CH3:23])[C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1.[OH-].[NH4+:25].S([O-])([O-])=O.[Na+].[Na+]>C1COCC1>[CH2:3]([O:10][C:11]1[CH:18]=[CH:17][C:14]([C:15]#[N:25])=[C:13]([N+:19]([O-:21])=[O:20])[C:12]=1[O:22][CH3:23])[C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1Iodine (272 g, 1.1 mmol) was added to a mixture of 4-(benzyloxy)-3-methoxy-2-nitrobenzaldehyde (Step 3, 220 g, 766 mmol) and ammonium hydroxide (28% solution, 3 L) dissolved in THF (5 L). After 16 h the reaction mixture was treated with sodium sulfite (49 g, 383 mmol) and concentrated under reduced pressure to afford a thick slurry. The slurry was filtered, washed with water (250 mL) and dried to afford the title compound as a solid (206 g, 95%): 1H NMR (DMSO-d6) δ: 7.89 (1H, d), 7.59 (1H, d), 7.49 (2H, m), 7.40 (3H, m), 5.35 (2H, s), 3.91 (3H, s).
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