How is 1-Cyclopropyl-6,7,8-trifluoro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid (CAS: 94695-52-0) typically synthesized?

1-Cyclopropyl-6,7,8-trifluoro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid is synthesized via a multistep process involving the alkylation of 6,7,8-trifluoroquinoline with cyclopropyl chloride, followed by subsequent reactions to introduce the oxo and carboxylic acid functionalities. Common methods include the use of triethylamine as a base and chlorotriphenylphosphine as a catalyst. The overall yield can range from 50% to 70%, depending on the purity of starting materials and reaction conditions.