[CH3:1][O:2][C:3]1[CH:9]=[CH:8][C:6]([NH2:7])=[C:5]([N+:10]([O-:12])=[O:11])[CH:4]=1.[C:13](O)(=O)[CH3:14].[C:17](O[BH-](OC(=O)C)OC(=O)C)(=O)[CH3:18].[Na+].C(=O)(O)[O-].[Na+]>ClCCl>[CH:13]1([CH2:14][NH:7][C:6]2[CH:8]=[CH:9][C:3]([O:2][CH3:1])=[CH:4][C:5]=2[N+:10]([O-:12])=[O:11])[CH2:18][CH2:17]1A 5 L vessel was charged with 4-methoxy-2-nitroaniline (160 g, 952 mmol) in dichloromethane (2.44 L) and cooled to 10° C. Cyclopropanecarboxyaldehyde (100 g, 143 mmol) was added in four 25 gram portions followed by acetic acid (300 ml, 523 mmol), which was added via addition funnel over 20 minutes. After 45 minutes, the vessel was charged with sodium triacetoxyborohydride (444 g, 209 mmol) portionwise. The mixture was warmed to ambient temperature over 4 hours and stirred for an additional 14 hours. The mixture was treated with saturated aqueous sodium bicarbonate (100 mL) and poured into sodium bicarbonate (4 L, aqueous saturated) and dichloromethane. The organic extract was concentrated in vacuo, providing the titled compound.
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