Morpholine → HCID 13533247, compound

Participants

Reaction Steps

5 g of 5-(α-bromopropionyl)-8-hydroxy-3,4-dihydrocarbostyril (IV) was suspended in 30 ml of benzene, and 4.2 ml of morpholine (III) was added to the suspension followed by allowing the mixture to react for 4 hours while heating under refluxing. The reaction mixture was filtered and the filtrate was washed with water followed by concentration under reduced pressure to remove any remaining water. The resulting residue was dissolved in 50 ml of isopropanol, and the solution was adjusted to a pH of 2 - 3 with concentrated hydrochloric acid. The viscous precipitate formed upon ice-cooling was separated and dissolved in acetone by heating. After allowing the solution to cool, the precipitate formed was dissolved in 30 ml of water and adjusted to a pH of 7.5 - 8 with sodium bicarbonate. The precipitate formed upon ice-cooling was filtered and dissolved in 10 ml of a 47% aqueous hydrobromic acid followed by concentration under reduced pressure. The residue thus obtained was washed with 10 ml of ethanol and recrystallized from ethanol to obtain 2.6 g of white amorphous 5-(α-morpholinopropionyl)-8-hydroxy-3,4-dihydrocarbostyril (IIb) hydrobromide monohydrate having a melting point of 235° - 236° C (with decomposition).

Provenance & Evidence