反应详情

1.1 g of 3-(5-amidino-2-benzofuranyl)-2-[4-[((3S)-3-pyrrolidinyl)oxy]phenyl]propionic acid dihydrochloride was dissolved in 20 ml of water. During ice cooling and stirring, 1.4 g of ethyl acetimidate hydrochloride was added gradually to the thus prepared solution while adjusting the pH of the solution to 8.5 with 1N sodium hydroxide aqueous solution. The resulting mixture was stirred for 15 minutes with ice cooling, and then adjusted to pH 2.0 with dilute hydrochloric acid. After concentrating the resulting reaction solution to dryness, the thus obtained residue was subjected to reversed phase high performance liquid chromatography using a column packed with octadecyl-bonded silica gel and using a water/acetonitrile mixture as -an elution solvent. Thereafter, the thus eluted fractions of interest were pooled, mixed With dilute hydrochloric acid, and then concentrated to dryness. In this way, 780 mg of the title compound was obtained in a solid form.

1. stirringThe resulting mixture was stirred for 15 minutes with ice cooling
2. concentrationAfter concentrating
3. customthe resulting reaction solution to dryness
4. concentrationconcentrated to dryness