Oxalyl chloride → HCID 54685311, compound

Participants

Reaction Steps

3[R]-Phenylvaleric acid of formula VV-3 (400 mg) is added to methylene chloride (5 mL) followed by oxalyl chloride (0.21 mL). That mixture is heated at reflux for 3 hours. The methylene chloride is removed and 1,3,5-trimethylbenzene (10 mL) is added. The solution of the acid chloride is then heated to reflux temperatures and the title product of Preparation 87 [VV-2](210 mg) and triethylamine (210 mg) (both in 1.5 mL of 1,3,5-trimethylbenzene) are added dropwise. After complete addition the reaction is heated for an addition 3 hours. The reaction is cooled to room temperature and the solid removed by filtration. The filtrate is evaporated and the resulting residue is diluted with methanol (35 mL) and 0.5N NaOH (4 mL) and that mixture stirred at room temperature overnight. The methanol is removed and water (35 mL) added. The aqueous is extracted with ether/hexane (2×35 mL) and the aqueous is acidified with 1.6N HCl at 0° C. to pH 3. That aqueous is extracted with ethyl acetate, dried and solvent removed in vacuo to yield 318.5 mg of the title product VV-5. Chromatography over silica gel (EtOAc/methylene chloride 1:8) affords 249.2 mg of the title product.

Provenance & Evidence