Hydrochloric Acid → 3-(4-(Cyclopropanecarbonyl)piperazine-1-carbonyl)benzoic acid

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Reaction Steps

To a solution of methyl 3-(4-(cyclopropanecarbonyl)piperazine-1-carbonyl)benzoate (0.95 g, 3 mmol) in water (10 mL) and tetrahydrofuran (10 mL) at 0° C., lithium hydroxide monohydrate (250 mg, 6 mmol) was added. The mixture was stirred at that temperature for 2 h. The resulting mixture was neutralized to pH=5 with hydrochloric acid, and extracted with ethyl acetate (100 mL×4) and concentrated to obtain a white solid of 3-(4-(cyclopropanecarbonyl)piperazine-1-carbonyl)benzoic acid (0.76 g, yield 83%). LC-MS (ESI) m/z: 303 (M+1)+. 3-(4-(cyclopropanecarbonyl)piperazine-1-carbonyl)benzoic acid (610 mg, 2 mmol) was added to thionyl chloride (10 mL), and the mixture was added at room temperature for 48 h. Then the solvent was removed under reduced pressure, dried in vacuum to give 3-(4-(cyclopropanecarbonyl)piperazine-1-carbonyl)benzoyl chloride.

Provenance & Evidence