Propane sultone → 3-{[(1r,2r)-2-(Benzyloxy)cyclopentyl]amino}-1-propanesulfonic acid

Participants

Reaction Steps

To a solution of (1R,2R)-2-benzyloxycyclopentylamine (1.0 g, 5.2 mmol) in tetrahydrofuran (12 mL) was slowly added 1,3-propanesultone (601 mg, 5.0 mmol). The solution was stirred at reflux for 2 hours. The reaction was cooled to room temperature. The solid was collected by filtration and washed with acetone (2×15 mL). The product was suspended in EtOH and the solvent was evaporated (to remove THF residue). The solid was dried in vacuo, affording the title compound (717 mg, 46%). 1H NMR (D2O, 500 MHz) δ ppm 7.32 (m, 5H), 4.53 (d, 1H, J=11.2 Hz), 4.42 (d, 1H, J=11.2 Hz), 4.02 (m, 1H), 3.36 (m, 1H), 3.01 (t, 2H, J=7.8 Hz), 2.81 (t, 2H, J=7.8 Hz), 2.01 (m, 4H), 1.65 (m, 3H), 1.49 (m, 1H). 13C NMR (D2O, 125 MHz) δ ppm 137.00, 129.07, 129.01, 128.77, 81.78, 71.81, 63.89, 48.02, 45.34, 29.93, 27.43, 21.61, 20.94. [α]D=−38.8° (c=0.00122 in water). ES-MS 314 (M+1).

Provenance & Evidence