Ethanol → HCID 131731186, compound

Participants

Reaction Steps

A solution of N—BOC-L-phenylalanine-N-hydroxusuccinimide ester (400 mg, 1.1 mmol) in a mixture of ethanol (6 mL) and 1,4-dioxane (4 mL) was added to a solution of L-Phe-Homotaurine (273 mg, 1.0 mmol) in 1N NaOH (1.05 mL), water (3 mL) and ethanol (4 mL). The mixture was stirred at room temperature overnight. The solvent was removed under reduced pressure and the solid (601.9 mg) was suspended in a mixture of acetone (8 mL) and isopropanol (0.2 mL) and stirred overnight at room temperature. The mixture was heated under refluxed for 30 minutes and then was cooled to room temperature. The white solid was collected by filtration, washed with ether, then dried in the vacuum oven for 45 minutes. The resulting solid (423.1 mg) was dissolved in a mixture of water/tert-butanol (7:3, 5 mL) and treated with Amberlite IR-120 plus (washed, 15 g dry weight) for 2 minutes at room temperature. The resin was removed by filtration and washed 3 times with the mixed solvents of water and tert-butanol (10 mL). Concentrated HCl (4 mL) was added. The solvents were removed under reduced pressure, and the resulting solid was dried in vacuum. The compound was purified by recrystallization from a mixed solvent of THF and MeOH. The resulting solid was heated under reflux in methanol (about 3 mL) to remove the yellowish color. The solid was dried in vacuo. Compound X was obtained as white solid (84.4 mg, 20%). The 1H and 13C NMR were consistent with the structure.

Provenance & Evidence