HCID 13606798, compound → HCID 13606799, compound

Participants

Reaction Steps

A suspension of ethyl 10-amino-7-methyl-4-oxo-4H-pyrimido[2,1-a]isoquinoline-3-carboxylate (400 mg) in a mixture of acetic acid (6 ml) and 36% hydrochloric acid (3 ml) was refluxed for 55 minutes. The mixture was cooled and diluted with water. The precipitated solid obtained was collected and dissolved into 6 ml of 1N aqueous sodium hydroxide. The resulting solution was filtered for removal of insoluble materials. The filtrate obtained was cooled and adjusted to pH 6 with 1N hydrochloric acid and neutralized with acetic acid to give 10-amino-7-methyl-4-oxo-4H-pyrimido[2,1-a]isoquinoline-3-carboxylic acid (270 mg).

Provenance & Evidence