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0 °C

1-(6-Methoxy-[1,5]naphthyridin-4-yl)-pyrrolidin-3-ol (7.67 g, 31.3 mmole), triethylamine (8.73 mL, 63 mmole) and catalytic amount of 4-dimethylaminopyridine dissolved in DCM (100 mL) and cooled to 0° C. The solution was degassed with argon. Methanesulfonyl chloride (2.9 mL, 37.6 mmole) was added dropwise over 30 minutes. The reaction was stirred under argon for 30 minutes at 0° C. and then stirred at room temperature for 1 h. The reaction mixture was concentrated in vacuo. The residue was purified on column chromatography (silica, 1-5% MeOH in chloroform). The solvent was removed in vacuo to afford the title compound as a white solid (7.0 g, 69%): LC-MS (ES) m/z 324 (M+H)+.

1. customThe solution was degassed with argon
2. stirringstirred at room temperature for 1 h
3. concentrationThe reaction mixture was concentrated in vacuo
4. customThe residue was purified on column chromatography (silica, 1-5% MeOH in chloroform)
5. customThe solvent was removed in vacuo