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0 °C

(2R,3R)-2-(3-chloro-4-cyano-2-methylphenylamino)-3-hydroxybutanoic acid (802 mg, 3.0 mmol) and 4-(methylsulfonyl)benzohydrazide (638 mg, 3.0 mmol) were coupled together in a procedure analogous to that described for the preparation of intermediate 3b. The crude product was purified by boiling in chloroform (100 mL) followed by cooling to 0° C. and filtration to yield product as a red solid (900 mg, 65%). 1H NMR (500 MHz, acetone-d6, δ in ppm) 8.15 (AA′XX′, J=8.6 Hz, 2H), 8.06 (AA′XX′, J=8.7 Hz, 2H), 7.51 (d, J=8.7 Hz, 1H), 6.75 (d, J=8.7 Hz, 1H), 5.61 (d, J=7.5 Hz, 1H), 4.28 (m, 1H), 4.18 (dd, J=5.0, 7.2 Hz, 1H), 3.18 (s, 3H), 2.34 (s, 3H), 1.39 (d, J=6.3 Hz, 3H).

1. customThe crude product was purified
2. filtrationfiltration