Propane sultone → 3-{[(1S)-2-ethoxy-1-methyl-2-oxoethyl]amino}-1-propanesulfonic acid

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To a solution of L-alanine ethyl ester (1.67 g, 14.3 mmol) in tetrahydrofuran (25 mL) was slowly added 1,3-propanesultone (1.42 g, 11.9 mmol). The solution was stirred at reflux for 2 hours. The reaction was cooled to room temperature. The solid was collected by filtration, washed with acetone (2×25 mL) and dried in vacuo, affording the title compound (1.19 g, 42%). 1H NMR (D2O, 500 MHz) δ ppm 4.16 (m, 2H), 4.01 (m, 1H), 3.12 (m, 2H), 2.87 (t, 2H, J=7.3 Hz), 2.01 (m, 2H), 1.43 (d, 3H, J=7.3 Hz), 1.14 (t, 3H, J=6.8 Hz). 13C (D2O, 125 MHz) δ ppm 170.22, 63.84, 55.69, 47.94, 44.73, 21.51, 14.05, 13.25. [α]D=−2.4° (c=0.0022 in water), ES-MS 240 (M+1).

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