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(S)-4-(2-(2-(4-amino-1,3-dioxoisoindolin-2-yl)acetoxy)-2-(3-(cyclopropylmethoxy)-4 (difluoromethoxy)phenyl)ethyl)-3,5-dichloropyridine 1-oxide (20.0 mg; 0.032 mmol) was dissolved in DMF (2 ml) and cooled down to 0° C. in a ice bath. 2-methoxyacetyl chloride (20.0 mg; 0.184 mmol) and DMAP (0.048 mmol; 5.89 mg) were added to the reaction solution that was stirred a 0° C. for 2 hours. After that time, the reaction was quenched with aqueous HCl (1M) (20 ml) and extracted with EtOAc (20 ml). The organic phase was further washed with HCl (1M) (3×20 ml), dried over Na2SO4 and the solvent removed under reduced pressure to afford the titled compound (15.0 mg; 67% yield). 1H NMR (400 MHz, acetone) δ ppm 10.33-10.47 (m, 1H), 8.80-8.93 (m, 1H), 8.22 (s, 2H), 7.83-7.95 (m, 1H), 7.57-7.67 (m, 1H), 7.16-7.24 (m, 2H), 7.04-7.11 (m, 1H), 6.94 (t, J=75.00 Hz, 1H), 6.13-6.22 (m, 1H), 4.46 (s, 2H), 4.14 (d, J=3.09 Hz, 2H), 3.91-4.06 (m, 2H), 3.65 (s, 3H), 3.49-3.58 (m, 1H), 3.26-3.38 (m, 1H), 1.17-1.39 (m, 1H), 0.54-0.69 (m, 2H), 0.36-0.48 (m, 2H). MS/ESI+ [MH]+=694.1.

1. customAfter that time, the reaction was quenched with aqueous HCl (1M) (20 ml)
2. extractionextracted with EtOAc (20 ml)
3. washThe organic phase was further washed with HCl (1M) (3×20 ml)
4. dry with materialdried over Na2SO4
5. customthe solvent removed under reduced pressure