[N+:1]([C:4]1[CH:5]=[C:6]([CH:15]=[CH:16][CH:17]=1)[C:7]([C:9]1[CH:10]=[N:11][CH:12]=[CH:13][CH:14]=1)=[O:8])([O-])=O.[Sn](Cl)Cl.O.[OH-].[Na+]>C(O)C.Cl>[NH2:1][C:4]1[CH:5]=[C:6]([CH:15]=[CH:16][CH:17]=1)[C:7]([C:9]1[CH:10]=[N:11][CH:12]=[CH:13][CH:14]=1)=[O:8]3-(3-Nitrobenzoyl)pyridine (1.55 g, 0.006 mole) was suspended in ethanol (35 ml) and treated portionwise with a solution of tin (11) chloride (4.56, 0.024 mmole) in conc. HCl (7 ml). The reaction mixture was stirred at 50° C. for 2 hours. After allowing to cool to room temperature, water (50 ml) was added and the mixture basified with 10% aqueous sodium hydroxide, extracted into ethyl acetate, dried (Na2SO4) and evaporated in vacuo to afford the title compound (1.14 g, 85%) as a pale oil
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