反应详情

温度

15 °C

1-methyl-2-[N-[4-amidinophenyl]aminomethyl]benzimidazol-5-yl-carboxylicacid-N-(2-pyridyl)-N-(2-ethoxycarbonylethyl)amide oxalate compound of formula-6a (100 g) was added to acetonitrile (1200 ml) and water (800 ml) at 25-35° C. and then cooled to 12-18° C. Potassium carbonate (117 g) was added to the reaction mixture and stirred for 15 minutes at 12-18° C. A solution of hexyl 1H-imidazole-1-carboxylate compound of formula-4 (60 g) in acetonitrile (150 ml) was slowly added to the reaction mixture over a period of 25 minutes at 12-18° C. and stirred for 14 hours at 15-20° C. After completion of the reaction, water was added to the reaction mixture and stirred for 30 minutes. Filtered the solid, washed with acetonitrile followed by aqueous acetonitrile and then dried to get title compound. Dichloromethane was added to the obtained compound and stirred for 15 minutes. Water was added to the reaction mixture and stirred for 20 minutes at 25-35° C. Both the organic and aqueous layers were separated, and the dichloromethane layer was washed with water followed by sodium chloride and then distilled off completely under reduced pressure. Acetone (600 ml) was added to the obtained residue and stirred for 45 minutes at 25-35° C. to obtain a clear solution. Water (500 ml) was added to the obtained solution and stirred for 45 minutes at 25-35° C. to get the solid. Filtered the solid, washed with water and finally with methyl tertiary butyl ether and then dried to get the pure title compound. Further the obtained solid, recrystallized from ethylacetate and ethanol.

1. stirringstirred for 14 hours at 15-20° C
2. additionwas added to the reaction mixture
3. stirringstirred for 30 minutes
4. filtrationFiltered the solid
5. washwashed with acetonitrile
6. customdried