I(O)(=O)(=O)=O.[I:6]I.S(=O)(=O)(O)O.[Cl:13][C:14]1[C:19]([F:20])=[CH:18][CH:17]=[C:16]([Cl:21])[C:15]=1[C@H:22]([O:24][C:25]1[C:26]([NH2:31])=[N:27][CH:28]=[CH:29][CH:30]=1)[CH3:23]>C(O)(=O)C.O>[I:6][C:29]1[CH:30]=[C:25]([O:24][C@@H:22]([C:15]2[C:16]([Cl:21])=[CH:17][CH:18]=[C:19]([F:20])[C:14]=2[Cl:13])[CH3:23])[C:26]([NH2:31])=[N:27][CH:28]=1Periodic acid (60 mg, 0.24 mmol), iodine (130 mg, 0.5 mmol), and sulfuric acid (0.03 mL) were added sequentially to a stirred solution of 3-[(1R)-1-(2,6-dichloro-3-fluorophenyl)ethoxy]pyridin-2-amine (0.97 mmol) in a mixture of acetic acid (3 mL) and H2O (0.5 mL). The resulting solution was heated to 80° C. for 5 h. The cooled reaction mixture was quenched with Na2SO3 (80 mg) and basicified with saturated Na2CO3 (2×100 mL) to pH 7. CH2Cl2 (2×50 mL) was added to extract the aqueous solution. The combined organic layers were dried over Na2SO4 then filtered and concentrated under vacuum. The residue was purified by flash chromatography (eluting with 35→40% EtOAc in hexanes) to give the title compound as a yellow oil (254 mg; 0.6 mmol; 61.6% yield); MS (APCI) (M+H)+ 426. 1H NMR (400 MHz, chloroform-D) δ ppm 1.81 (d, J=6.8 Hz, 3H) 4.86 (s, 2H) 5.98 (q, J=6.57 Hz, 1H) 6.96 (d, J=1.5 Hz, 1H) 7.08 (dd, J=9.0, 8.0 Hz, 1H) 7.31 (dd, J=8.8, 4.8 Hz, 1H) 7.78 (d, J=1.8 Hz, 1H).
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