Cl.NO.[OH-].[Na+].C(O)(=O)C.C[N:11](/[CH:13]=[N:14]/[C:15](=[O:23])[C:16]1[CH:21]=[CH:20][C:19]([OH:22])=[CH:18][CH:17]=1)C>O1CCOCC1>[O:23]1[C:15]([C:16]2[CH:21]=[CH:20][C:19]([OH:22])=[CH:18][CH:17]=2)=[N:14][CH:13]=[N:11]1To a solution of hydroxylamine hydrochloride (354 mg, 5.1 mmol) in an a mixture of aqueous 5N sodium hydroxide solution (1 mL, 5 mmol), acetic acid (10 mL) and dioxane (8.5 mL) was added the N-[(1E)-(dimethylamino)methylene]-4-hydroxybenzamide from step 1 of this Example (815 mg, 4.24 mmol). The reaction was stirred at 90° C. for 3 hrs. Upon cooling to room temperature, the solvent was removed under vacuum and residue was purified by column chromatography on an 80 gram biotage silica gel cartridge eluting with 20-50% ethyl acetate/hexanes (gradient) to give the product as white solid. LRMS calc: 162.0; obs: 163.2 (M+1).
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