[ClH:1].[N+:2]([C:5]1[C:6]([N:11]2[CH2:16][CH2:15][CH:14]([NH:17]C(=O)OC(C)(C)C)[CH2:13][CH2:12]2)=[N:7][CH:8]=[CH:9][CH:10]=1)([O-:4])=[O:3]>O1CCOCC1>[ClH:1].[N+:2]([C:5]1[C:6]([N:11]2[CH2:16][CH2:15][CH:14]([NH2:17])[CH2:13][CH2:12]2)=[N:7][CH:8]=[CH:9][CH:10]=1)([O-:4])=[O:3]A solution of 4 N hydrochloric acid in dioxane (10 ml) was added to tert-butyl [1-(3-nitropyridin-2-yl)piperidin-4-yl]carbamate (Intermediate 38; 1.3 g, 4.2 mmol). The mixture was stirred at room temperature for 1 h under nitrogen gas. The solvent was removed in vacuo to give the title compound as a yellow powder (500 mg).
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