反应详情

Tetrahydrofuran-2,5-dicarboxylic anhydride (1.5 g., 10 mmole) was dissolved in 150 ml. of toluene in a 500 ml. round bottom flask equipped with a Dean-Stark trap and condenser. 1-(4-Aminobutyl)-4-(2-pyrimidinyl)piperazine (2.59 g., 11 mmole) was added and the mixture was refluxed for 24 hours. When the analysis failed to detect the expected product, the solvent was removed in vacuum and replaced with xylene. Reflux was continued for 48 hours. The solvent was then removed in vacuum and the residue column chromatographed on 100 g. of silica gel using a gradient elution from pure chloroform to 5% ethanol/chloroform. The relevant fractions were combined and concentrated in vacuum and the product crystallized from isopropanol with the addition of 4N HCl/isopropanol. 1.2 Grams of the title compound was obtained as the dihydrochloride; m.p. 221°-222° C.

1. customround bottom flask equipped with a Dean-Stark trap and condenser
2. temperaturethe mixture was refluxed for 24 hours