Sodium Hydroxide → 5-carboxymethyl-3-(1-carboxynonylamino)-2,3-dihydro-1,5-benzothiazepin-4(5H)-one

Participants

Reaction Steps

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.

Provenance & Evidence