Propionyl chloride → 4-(4-bromophenyl)-5-{[(3S)-1-propanoyl-3-pyrrolidinyl]methyl}-2,4-dihydro-3H-1,2,4-triazol-3-one

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Reaction Steps

In a 4 mL screwcap vial was placed 4-(4-bromophenyl)-5-[(3S)-3-pyrrolidinylmethyl]-2,4-dihydro-3H-1,2,4-triazol-3-one hydrochloride (0.278 mmol). Added to the vial were dichloromethane (2 mL) and N,N-diisopropylethylamine (0.859 mmol). The vial contents were stirred for 1 min, at which point propanoyl chloride (0.319 mmol) was added. The vial was capped and the contents were stirred at room temperature for 2 h. The reaction was quenched with saturated aq NH4Cl (1 mL) and the solution was stirred vigorously for 1 min. The separation of the two layers occurred upon settling of the solution. The organic layer was removed, dried over sodium sulfate, filtered, and concentrated in vacuo. Silica gel chromatography (0-10% methanol:ethyl acetate) was utilized to purify the title compound (65 mg, 61% yield). MS(ES)+ m/e 379.1, 380.8 [M+H]+.

Provenance & Evidence