[I-].[C:2]([C:4]1[CH:13]=[C:12]2[C:7]([CH:8]=[CH:9][CH:10]=[N+:11]2[CH2:14][CH:15]=[CH2:16])=[CH:6][CH:5]=1)#[N:3].[OH-:17].[K+].O>O1CCOCC1.O.[Fe-3](C#N)(C#N)(C#N)(C#N)(C#N)C#N.[K+].[K+].[K+]>[O:17]=[C:10]1[CH:9]=[CH:8][C:7]2[C:12](=[CH:13][C:4]([C:2]#[N:3])=[CH:5][CH:6]=2)[N:11]1[CH2:14][CH:15]=[CH2:16]
A mixture of 7-cyano-1-(2-propen-1-yl)quinolinium iodide (1.75 g, 5.4 mmol), potassium hydroxide (1.33 g, 23.76 mmol) and potassium ferricyanide (3.9 g, 11.9 mmol) in 50% 1,4-dioxane/water was stirred at rt for 2 h. Water (50 ml) was then added and the organic phase was extracted with 10% methanol/DCM (2×100 ml). The combined organic phases were washed with water (100 ml) then dried and evaporated. The residue was chromatographed on silica gel, eluting with 0-5% methanol-DCM to afford the desired compound (0.6 g, 55%).
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