C([Mg]Cl)(C)C.Br[C:7]1[CH:8]=[CH:9][C:10]([O:13][CH3:14])=[N:11][CH:12]=1.Br[C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][N:17]=1>C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.Cl[Pd]Cl.[Fe+2].O1CCCC1>[CH3:14][O:13][C:10]1[N:11]=[CH:12][C:7]([C:16]2[CH:21]=[CH:20][CH:19]=[CH:18][N:17]=2)=[CH:8][CH:9]=1
In a 300 mL inner volume flask replaced by nitrogen, tetrahydrofuran solution of isopropylmagnesium chloride (19.5% by weight, 30.3 g, 57.5 mmol) was charged, and cooled at 10° C., and then tetrahydrofuran solution (20 g) of 5-bromo-2-methoxypyridine (9.4 g, 50.0 mmol) was added dropwise in the range of 10 to 20° C. for 1.0 hour. After adding dropwise, the reaction mixture was stirred in the range of 10 to 20° C. for 1.5 hours, and then added dropwise to the tetrahydrofuran solution (20 g) containing 2-bromopyridine (7.9 g, 50.0 mmol) and [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II) (0.14 g, 0.25 mmol) in the range of 10 to 20° C. for 2.0 hours. After adding dropwise, the reaction mixture was stirred in the range of 10 to 20° C. for 4.0 hours, however, 6-methoxy-3,2′-bipyridine could not be obtained.
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