Hydrochloric Acid → ethanesulfonic acid (2-hydroxy-ethyl)-[5-(1-methyl-1H-indol-2-yl)-pyridin-3-yl]-amide

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A flask is charged with ethanesulfonic acid [5-(1-methyl-1H-indol-2-yl)-pyridin-3-yl]-amide (Example 226, 200 mg, 0.634 mmol) and DMF (3 mL). The reaction is cooled to 0° C. and sodium hydride (38.0 mg, 0.951 mmol) is added. The reaction is stirred at room temperature for 10 min, then 2-chloro-ethoxytrimethylsilane (0.154 mL, 0.951 mmol) is added. The reaction is stirred at 100° C. for 16 h then cooled to room temperature. Aqueous 1M HCl (1 mL) is added and stirring is continued for 30 min. The mixture is purified using an Xbridge C18 eluting with a 10 to 100% acetonitrile-water gradient to afford ethanesulfonic acid (2-hydroxy-ethyl)-[5-(1-methyl-1H-indol-2-yl)-pyridin-3-yl]-amide. MS (ESI) m/z 360.1 (M+H)+. 1H NMR (400 MHz, MeOD) δ ppm 1.42 (t, J=7.3 Hz, 3H), 3.29 (t, 2H), 3.70 (t, J=5.6 Hz, 2H), 3.84 (s, 3H), 3.96 (t, J=5.6 Hz, 2H), 6.75 (s, 1H), 7.14 (td, J=7.5, 0.9 Hz, 1H), 7.28 (td, J=7.7, 1.0 Hz, 1H), 7.49 (d, J=8.3 Hz, 1H), 7.64 (d, J=7.6 Hz, 1H), 8.18 (t, J=2.1 Hz, 1H), 8.71 (d, J=2.3 Hz, 1H), 8.75 (d, J=1.8 Hz, 1H). HRMS (ESI) m/z 360.1383 [(M+H)+ Calcd for C18H12N3O3S 360.1376].

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