Triethylamine → Ethyl 5-(benzyloxy)-1-(methylsulfonyl)-2-(4-((methylsulfonyloxy)methyl)piperidin-1-yl)-6-oxo-1,6-dihydropyrimidine-4-carboxylate

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Reaction Steps

To a solution of ethyl 5-(benzyloxy)-2-(4-(hydroxymethyl)piperidin-1-yl)-6-oxo-1,6-dihydropyrimidine-4-carboxylate (0.814 g, 2.1 mmol) in THF (20 mL) was added methanesulfonyl chloride (0.327 mL, 4.20 mmol) followed by Et3N (0.732 mL, 5.25 mmol). The resulting mixture was stirred at room temperature for 2.5 h (white solids precipitated out over the reaction time). The mixture was diluted with ethyl acetate (50 mL) and washed with water followed by brine. The organic phase was dried (Na2SO4), filtered and concentrated to give the title compound as an amber oil (1.1320 g, 99% yield). 1H NMR (500 MHz, CDCl3) δ: 7.44 (2H, d, J=7.32 Hz), 7.39-7.32 (3H, m), 4.98 (2H, s), 4.67-4.64 (2H, m), 4.35 (2H, q, J=7.1 Hz), 4.09 (2H, d, J=6.4 Hz), 3.46 (3H, s), 3.02 (3H, s), 2.91 (2H, td, J=12.9, 2.4 Hz), 2.08-2.00 (1H, m), 1.86-1.84 (2H, m), 1.35-1.28 (5H, m). LCMS (M+H) calcd for C22H30N3O9S2: 544.14; found: 544.30.

Provenance & Evidence