[CH3:1][C:2]([C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1)([CH3:6])[C:3](O)=[O:4].C[N:14](C=O)C.C(Cl)(=O)C(Cl)=O>C(Cl)Cl>[CH3:1][C:2]([C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1)([CH3:6])[C:3]([NH2:14])=[O:4]To a solution of 2-methyl-2-phenylpropionic acid in 100 mL of CH2Cl2 was added 0.50 mL of DMF and oxalyl chloride (3.40 g, 26.8 mmol). The mixture was stirred at 23° C. for 4 hours then the solvent was removed under reduced pressure. The crude material was dissolved in 50 mL of THF and 30 mL of NH4OH was added. The mixture was stirred at 23° C. for 1 hour then and the mixture was concentrated under reduced pressure. The crude product was dissolved in 150 mL of EtOAc and washed with 100 mL of 2 N HCl, 100 mL NaHCO3, and 100 mL of brine. The organic phase was dried over Na2SO4 and concentrated. The product was purified by recrystallization from EtOAc/hexanes to provide 3.50 g (88% yield) of the desired product as a white powder.
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