[OH:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][CH:11]=1)[CH:8]=[N:7][CH:6]=[CH:5]2.[B-](F)(F)(F)F.C1C=CN=CC=1.C1C=CN=CC=1.[IH2+:29].FC(F)(F)S(O)(=O)=O>ClCCl>[I:29][C:3]1[C:2]([OH:1])=[CH:11][CH:10]=[C:9]2[C:4]=1[CH:5]=[CH:6][N:7]=[CH:8]2Under argon atmosphere 1.77 g (12.2 mmol) of compound 7 were added to a solution of 5.0 g (13.5 mmol) bis(pyridin)iodonium tetrafluoroborate in 100 mL of dry dichloromethane. A solution of 2.4 mL (4 g, 26.8 mmol) trifluoromethane sulfonic acid in 20 mL dry dichloromethane was added dropwise at 0° C. and the mixture was stirred for 3 hours at room temperature. The solvents were removed by distillation and the remainder was treated with aqueous NaHCO3 solution. The precipitate was filtered, washed with water and dried to yield 3.2 g (97%) of compound 10 as a beige solid.
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