[C:1]([C:5]1[CH:10]=[CH:9][N+:8]([O-])=[CH:7][CH:6]=1)([CH3:4])([CH3:3])[CH3:2].COS(=O)(=O)OC.[C-:19]#[N:20].[K+].C(Cl)(Cl)Cl>C(O)C.O.O.CCCCCC>[C:19]([C:9]1[CH:10]=[C:5]([C:1]([CH3:4])([CH3:3])[CH3:2])[CH:6]=[CH:7][N:8]=1)#[N:20]A mixture of 8.00 g (53 mmol) of 4-t-butylpyridine N-oxide and 6.7 g (53 mmol) of dimethylsulfuric acid was stirred at 70° to 80° C. for 3 hours. After cooling, the mixture was dissolved in 60 ml of an ethanol-water mixture. While the mixture was stirred at 10° C. or lower, a solution of 6.9 g (0.11 mol) of potassium cyanide in 20 ml of water was dropwise added, followed further by stirring at the same temperature for one hour and at room temperature for 1.5 hours. After an addition of 200 ml of water, the mixture was stirred with chloroform, dried over anhydrous sodium sulfate, and then concentrated under a reduced pressure. Separation by silica gel column chromatography (ethyl acetate:hexane=1:4 for the first time, 1:9 for the second time) gave 2.00 g of an oily product (yield 23.6%).
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