反应详情

1.3 g of sulfodehydroabietic acid is dissolved in 15 ml of ethanol and 0.472 mg of silver carbonate and 20 ml of water are added thereto. 0.635 g of ethyl L-cysteinate hydrochloride are added to the mixture and said mixture is stirred at room temperature. The precipitates are filtered off and the filtrate is concentrated to dryness under reduced pressure. The residue is recrystallized from a mixture of methanol and ethyl acetate, whereby 1.5 g of sulfodehydroabietic acid ethyl L-cysteinate salt hemihydrate is obtained.

1. filtrationThe precipitates are filtered off
2. concentrationthe filtrate is concentrated to dryness under reduced pressure
3. customThe residue is recrystallized from a mixture of methanol and ethyl acetate