[Br:1][C:2]1[C:3]([CH2:8][OH:9])=[N:4][CH:5]=[CH:6][CH:7]=1.[I:10][C:11]1[CH:16]=[CH:15][C:14]([Cl:17])=[CH:13][C:12]=1O.C(P(CCCC)CCCC)CCC.N(C(N1CCCCC1)=O)=NC(N1CCCCC1)=O>C1C=CC=CC=1.C(OCC)(=O)C>[Br:1][C:2]1[C:3]([CH2:8][O:9][C:16]2[CH:15]=[C:14]([Cl:17])[CH:13]=[CH:12][C:11]=2[I:10])=[N:4][CH:5]=[CH:6][CH:7]=1(3-Bromo-pyridin-2-yl)-methanol (3.4 g, 18 mmol), and 2-iodo-5-chlorophenol 4.5 g, 18 mmol), are dissolved in benzene (60 mL) and cooled to 0° C. To the solution is added tributylphosphine (15 mL, 90 mmol), and 1,1′-(azodicarbonyl) dipiperidine (ADDP) (6.6 g, 18 mmol) and the mixture is heated at 40° C. for 3 h. The reaction mixture is diluted with ethyl acetate, washed with saturated aqueous NH4Cl and brine, dried over MgSO4, filtered, and concentrated under reduced pressure. The resulting residue is purified by flash chromatography (Biotage® Si65M, 15% ethyl acetate/hexane) to yield 3.77 g (51%) of the title compound as a white solid. GCMS m/e 296, 298 [M-I]−.
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