Citric Acid → HCID 178483047, compound

Participants

Reaction Steps

In 15 mL of ethanol was dissolved 2.675 g of N-tert-butoxycarbonyl-trans-4-[5-ethoxycarbonyl-2-(dimethylamino)pyrimidin-4-yloxy]cyclohexylamine (the compound of Reference Example 9-50 prior to deprotection treatment), 3.27 mL of an aqueous 3N-sodium hydroxide solution was added thereto at room temperature, and the mixture was stirred overnight. The reaction mixture was diluted with water, and then, citric acid was added thereto until the solution became neutral. The precipitated crystals were collected by filtration, washed with water and dried under reduced pressure to obtain 2.015 g of N-tert-butoxycarbonyl-trans-4-[5-carboxy-2-(dimethylamino)pyrimidin-4-yloxy]cyclohexylamine.

Provenance & Evidence