Diphenylpropionic acid → N-Methoxy-N-methyl-3,3-diphenyl-propionamide

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Reaction Steps

To a solution of 3,3-diphenylpropionic acid (CAS RN: [606-83-7], 1.5 g) in DMF (17 mL) was added TBTU (2.98 g) and Et3N (2.1 mL) at 0° C. The reaction mixture was stirred at rt for 10 min and again cooled down to 0° C. N,O-dimethylhydroxylamine hydrochloride (0.78 g) was added and the mixture was stirred at rt for 1 hour. A saturated aqueous solution of NaHCO3 was added, the phases were separated and the inorganic one was extracted with TBME (2×). The combined organic layers were washed with 1N aqueous KHSO4 and brine, dried over Na2SO4, filtered and concentrated in vacuo. The crude product was purified by flash chromatography on silica gel (EtOAc/n-heptane 1:1) to yield the title compound (1.52 g, 85%) as a colorless oil, MS (ESI+): m/z=270.2 ([M+H]+).

Provenance & Evidence