反应详情

2.0 g of 3-(5-amidinobenzo[b]thien-2-yl)-2-[4-[((3S)-3-pyrrolidinyl)oxy]phenyl]propionic acid dihydrochloride was dissolved in a solvent mixture of 10 ml of water and 10 ml of acetonitrile. With stirring, to the thus prepared solution was gradually added 20 g of ethyl (N-methyl)acetimidate hydrochloride which has been prepared in accordance with the procedure disclosed in The Journal of Organic Chemistry (vol. 33, pp. 1679-1681, 1968), while maintaining the pH level of the solution at 8.5 with 2 N sodium hydroxide aqueous solution. After distilling off the solvent, the resulting residue was washed with dichloromethane and then subjected to column chromatography using a column packed with a highly porous polymer type synthetic adsorbent (styrene-divinylbenzene polymer: Diaion HP-20) and using a water/acetonitrile mixture as an elution solvent, thereby effecting desalting. Fractions of interest thus pooled were subjected to reversed phase high performance liquid chromatography using a column packed with octadecyl-bonded silica gel. Thereafter, the thus eluted fractions of interest were pooled and then concentrated to dryness by passing through a C1 type of strongly basic ion exchange resin (Diaion SA-10, Nippon Rensui Co., Ltd.). In this way, 370 mg of the title compound was obtained in a solid form.

1. customhas been prepared in accordance with the procedure
2. distillationAfter distilling off the solvent
3. washthe resulting residue was washed with dichloromethane
4. concentrationconcentrated to dryness