2-(Trifluoromethyl)aniline → N-(2-trifluoromethyl-phenyl)-malonamic acid benzyl ester

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Reaction Steps

A solution of mono-benzyl malonate (890 mg, 4.6 mmol) in 3:1 CH2Cl2/DMF (24 mL) was treated sequentially with N,N-diisopropylethylamine (2.0 mL, 11.5 mmol), 2-trifluoromethyl-phenylamine (0.6 mL, 4.6 mmol), and HATU (2.1 g, 5.5 mmol). The mixture was stirred for 12 h at RT, concentrated in vacuo, and partitioned between EtOAc and sat. NH4Cl. The aqueous phase was extracted with EtOAc (1×). The combined organic extracts were washed with sat. NaHCO3 and brine, dried (Na2SO4), filtered, and concentrated in vacuo. The residue was purified by flash chromatography to provide N-(2-trifluoromethyl-phenyl)-malonamic acid benzyl ester as an oil (894 mg, 57% yield). This material was dissolved in EtOAc (35 mL). The resultant solution was charged with 10% Pd/C (178 mg), stirred under H2 (1 atm) for 12 h at RT, filtered, and concentrated in vacuo to provide N-(2-trifluoromethyl-phenyl)-malonamic acid (621 mg, 95% yield). MS found: (M+H)+=248.02.

Provenance & Evidence