[N:1]1[C:9]([NH2:10])=[C:8]2[C:4]([N:5]=[CH:6][NH:7]2)=[N:3][CH:2]=1.CC(C)([O-])C.[K+].F[C:18]1[CH:23]=[CH:22][C:21]([N+:24]([O-:26])=[O:25])=[CH:20][CH:19]=1>CS(C)=O.O>[N+:24]([C:21]1[CH:22]=[CH:23][C:18]([N:5]2[CH:6]=[N:7][C:8]3[C:4]2=[N:3][CH:2]=[N:1][C:9]=3[NH2:10])=[CH:19][CH:20]=1)([O-:26])=[O:25]In 100 ml of dimethyl sulfoxide, 4.05 g (30.0 mmol) of adenine was dissolved, and 3.5 g (31.0 mmol) of potassium tert-butoxide and 5.0 g (35.0 mmol) of 4-fluoronitrobenzene were added thereto, and the mixture solution was stirred at 80° C. for three hours. The solution was diluted with 200 mL of water and the precipitate formed was collected by filtration, washed with 100 mL of water and 30 mL of methanol in the order named and vacuum dried to obtain 7.2 g (84%) of a target product as a yellow solid.
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