[Br:1][C:2]1[CH:3]=[N:4][C:5]([O:8][C:9]2[CH:14]=[CH:13][CH:12]=[C:11]([CH2:15]Cl)[CH:10]=2)=[N:6][CH:7]=1.[P:17]([O:24]CC)([O:21][CH2:22][CH3:23])[O:18][CH2:19][CH3:20].C(OCC)(=O)C>CCCCCCC>[Br:1][C:2]1[CH:3]=[N:4][C:5]([O:8][C:9]2[CH:10]=[C:11]([CH:12]=[CH:13][CH:14]=2)[CH2:15][P:17](=[O:24])([O:21][CH2:22][CH3:23])[O:18][CH2:19][CH3:20])=[N:6][CH:7]=15-Bromo-2-(3-(chloromethyl)phenoxy)pyrimidine (810 mg, 2.70 mmol) was treated with triethyl phosphite (1 mL, 2.2 mmol), and heated to 150° C. After 16 h, the reaction mixture was removed from the heat and ethyl acetate (about 3 mL) followed by heptane were added. As the reaction mixture cooled an oily precipitate formed. The mixture was made homogenous by addition of ethyl acetate. Heptane was added dropwise until a white solid precipitated. Additional heptane was added and the solid was filtered, washed with heptane and dried in vacuo to afford the title compound (0.737 g, 68% yield) as a white solid. MS (APCI) M+1=401; 1H NMR (400 MHz, CDCl3) δ ppm 1.26 (t, J=6.92 Hz, 6H) 3.18 (d, J=21.64 Hz, 2H) 3.98-4.10 (m, 4H) 7.06-7.11 (m, 1H) 7.15 (q, J=2.01 Hz, 1H) 7.20-7.26 (m, 1H) 7.35-7.42 (m, 1H) 8.56 (s, 2H).
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