1,2-Dichloroethane → N'-((2R,3S)-3-(benzyloxy)-2-(3-chloro-4-cyano-2-methylphenylamino)-4,4,4-trifluorobutanoyl)-4-cyanobenzohydrazide

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To a solution of (2R,3S)-3-(benzyloxy)-2-(3-chloro-4-cyano-2-methylphenylamino)-4,4,4-trifluorobutanoic acid (280 mg) in THF (15 mL) were added 4-cyanobenzohydrazide (130 mg, 0.81 mmol), HOBt (109 mg, 0.81 mmol), EDC (232 mg, 1.21 mmol) and Et3N (0.25 mL, 1.79 mmol) at −20° C. sequentially. After addition, the mixture was stirred at −20° C. for 30 min., then room temperature overnight. The reaction was quenched by adding ice-water. After removal of the THF, the residue was extracted with EtOAc (200 mL). The EtOAc extracts were washed with water, brine and dried over Na2SO4. The filtrate was concentrated and purified by flash chromatography to give the title compound N′-((2R,3S)-3-(benzyloxy)-2-(3-chloro-4-cyano-2-methylphenylamino)-4,4,4-trifluorobutanoyl)-4-cyanobenzohydrazide (180 mg, 10%). 1H NMR (400 MHz, CDCl3, δ in ppm) 9.26 (b, 1H), 8.88 (b, 1H), 7.92 (d, J=8.4 Hz, 2H), 7.74 (d, J=8.4 Hz, 2H), 7.36˜7.39 (m, 5H), 7.28 (d, J=8.7 Hz, 1H), 6.44 (d, J=8.7 Hz, 1H), 5.22 (d, J=6.6 Hz, 1H), 4.93 (d, J=11.1 Hz, 1H), 4.80 (d, J=11.1 Hz, 1H), 4.66 (m, 1H), 4.33 (d, J=6.6 Hz, 1H), 2.27 (s, 3H).

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