[CH3:1][N:2]1[CH2:7][CH2:6][C:5]([C:18]#[CH:19])([O:8][C:9]2[CH:14]=[CH:13][CH:12]=[CH:11][C:10]=2[N+:15]([O-])=O)[CH2:4][CH2:3]1.Cl.CO.C(=O)([O-])[O-].[Na+].[Na+]>CCOCC.[Fe].O>[CH3:1][N:2]1[CH2:3][CH2:4][C:5]([O:8][C:9]2[CH:14]=[CH:13][CH:12]=[CH:11][C:10]=2[NH2:15])([C:18]#[CH:19])[CH2:6][CH2:7]1
A suspension of 1-methyl-4-ethynyl-4-(2-nitrophenoxy)piperidine (liberated from 10.0 g of the hydrochloride), 140 ml of methanol, 40 ml of water, 10 ml of conc hydrochloric acid and 20 g of iron (reduced electroytic) was stirred for 0.5 hr at 45° under nitrogen. The mixture was allowed to cool to room temperature, poured into saturated sodium carbonate solution, extracted twice with ether; dried over anhydrous potassium carbonate, filtered, and the solvent was evaporated to provide an oil. The oil was dissolved in ether. Precipitation with ethereal hydrogen chloride provided 8.59 g (83%) of product. Recrystallization from ethanol provided the analytical sample.
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