[OH:1][CH:2]([C:7]1[C:8]([I:18])=[C:9]2[CH:16]=[CH:15][N:14]([CH3:17])[C:10]2=[N:11][C:12]=1[CH3:13])[C:3]([O:5][CH3:6])=[O:4].CC(OI1(OC(C)=O)(OC(C)=O)OC(=O)C2C=CC=CC1=2)=O.[O-]S([O-])(=S)=O.[Na+].[Na+].C(OCC)(=O)C>ClCCl>[I:18][C:8]1[C:7]([C:2](=[O:1])[C:3]([O:5][CH3:6])=[O:4])=[C:12]([CH3:13])[N:11]=[C:10]2[N:14]([CH3:17])[CH:15]=[CH:16][C:9]=12
An 0° C. solution of methyl 2-hydroxy-2-(4-iodo-1,6-dimethyl-1H-pyrrolo[2,3-b]pyridin-5-yl)acetate (12.0 g, 33.3 mmol) in dichloromethane (DCM) (120 mL) was treated with Dess-Martin periodinane (19.84 g, 46.8 mmol) in one portion and warmed to ambient temperature. After 18 h, sat. aq. Na2S2O3 was added and the reaction mixture was stirred for 20 min. Ethyl acetate was added and the layers partitioned. The organic phase was washed with sat. aq. NaHCO3, brine, dried (Na2SO4), filtered and concentrated in vacuo. The residue was purified by ISCO (0-30% EtOAc-hexanes) to afford methyl 2-(4-iodo-1,6-dimethyl-1H-pyrrolo[2,3-b]pyridin-5-yl)-2-oxoacetate (9.6 g, 26.8 mmol, 74.5% yield) as light yellow solid: 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 2.58 (s, 3H) 3.86 (s, 3H) 3.93 (s, 3H) 6.35 (d, J=3.52 Hz, 1H) 7.22 (d, 1H). LC/MS (m/z) ES+=359.9 (M+1)+
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