A flask is charged with 1-methyl-1H-indol-2-ylboronic acid (90 mg, 0.512 mmol), 5-bromo-N,N-diethylpyridine-3-sulfonamide (100 mg, 0.341 mmol) and polymer supported Pd(PPh3)4 (189 mg, 0.017 mmol), and the flask is flushed with N2 for 5 min. 1,4-Dioxane (10 mL) and 2M K2CO3 in water (0.512 mL, 1.023 mmol) are added under N2 and the mixture is stirred at 90° C. under N2 for 2 h. The mixture is then cooled to room temperature and DMF (4 mL) is added. The mixture is concentrated in vacuo and the residue is filtered and the filtrate is purified by Xterra RP18 eluting with a 1:9 to 9:1 acetonitrile-water gradient to give N,N-diethyl-5-(1-methyl-1H-indol-2-yl)pyridine-3-sulfonamide. 1H NMR (400 MHz, DMSO-d6) δ ppm 1.10 (t, J=7.1 Hz, 6H), 3.29 (d, J=7.1 Hz, 4H), 3.80 (s, 3H), 6.85 (s, 1H), 7.08-7.14 (m, 1H), 7.26 (td, J=7.71, 1.26 Hz, 1H), 7.56 (dd, J=8.3, 0.5 Hz, 1H), 7.63 (d, J=7.8 Hz, 1H), 8.33 (t, J=2.1 Hz, 1H), 9.00 (d, J=2.0 Hz, 1H), 9.10 (d, J=2.2 Hz, 1H). HRMS: (ESI) m/z 344.1428 [(M+H)+ Calcd for C18H22N3O2S 344.1427].
