Triethylamine → Methyl 5-chloro-2-(3-((methylsulfonyl)oxy)azetidin-1-yl)nicotinate

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To a stirred solution of methyl 5-chloro-2-(3-hydroxyazetidin-1-yl)nicotinate (D62) (50 mg, 0.206 mmol) and triethylamine (0.057 ml, 0.412 mmol) in dimethylformamide (0.26 ml) cooled at 0° C., methansulfonyl chloride (0.016 ml, 0.206 mmole) was added dropwise and the reaction mixture stirred at the same temperature for 1 h. After solvent evaporation the obtained residue was purified by SPE-Si (5 g) eluting with a mixture petroleum ether/ethyl acetate from 90/10 to 70/30. Collected fractions, after solvent evaporation, afforded the title compound (D63) (53 mg)

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