Hydrochloric Acid → 2-[5-(4-Quinolin-2-ylpiperazin-1-yl)pentanoylamino]cyclohex-1-enecarboxylic acid

Participants

Reaction Steps

In 725 ml of 2-propanol and 365 ml of distilled water, 168.0 g of ethyl 2-[5-(4-quinolin-2-ylpiperazin-1-yl)pentanoylamino]cyclohex-1-enecarboxylate as synthesized in above Step 7-1-D was suspended. To the suspension 580 ml of 1N-aqueous sodium hydroxide was added and heated under reflux for 1.5 hours. After cooling, the reaction mixture was neutralized with 2N-hydrochloric acid. Whereupon precipitated crystals were recovered by filtration and dried to provide 131.8 g (83.4%) of 2-[5-(4-quinolin-2-ylpiperazin-1-yl)pentanoylamino]cyclohex-1-enecarboxylic acid.

Provenance & Evidence