反应详情

温度

60 °C

A mixture of 0.220 mg of N-1-butanesulfonyl-4-amino-3-(2,4-dichlorobenzylamino)benzamide, 0.3 ml of tetramethoxymethane and 2.0 ml of acetic acid was stirred at 60° C. for 4 hours. Acetic acid was distilled off under reduced pressure, and the residue was extracted with chloroform and with water. The chloroform layer was concentrated, and 4.0 ml of methanol and 36% hydrochloric acid (4 drops). were added to the residue. The mixture was stirred at 60° C. for 2 hours. The reaction solution was neutralized with a saturated aqueous solution of sodium hydrogencarbonate. The crystals precipitated were washed with water, and were dried to give 0.207 g of 6-(1-butanesulfonylcarbamoyl)-1-(2,4-dichlorobenzyl)-2-hydroxybenzimidazole (379).

1. distillationAcetic acid was distilled off under reduced pressure
2. extractionthe residue was extracted with chloroform and with water
3. concentrationThe chloroform layer was concentrated
4. additionwere added to the residue
5. stirringThe mixture was stirred at 60° C. for 2 hours
6. customThe crystals precipitated
7. washwere washed with water
8. customwere dried