反应详情

690 mg of the 5-carboxymethyl-3-(1-ethoxycarbonylnonylamino)-2,3-dihydro-1,5-benzothiazepin-4(5H)-one obtained in Example 18 was dissolved in 10 ml of ethanol and 4 ml of a 1N aqueous solution of sodium hydroxide and then reacted at room temperature for 3 hours. After the reaction mixture was concentrated under reduced pressure, the residue was dissolved in 5 ml of water. This solution was adjusted to pH 2 with hydrochloric acid. The precipitated white crystals were separated by filtration and washed thoroughly with water to obtain 600 mg of the desired compound.

1. concentrationAfter the reaction mixture was concentrated under reduced pressure
2. dissolutionthe residue was dissolved in 5 ml of water
3. customThe precipitated white crystals were separated by filtration
4. washwashed thoroughly with water