Imidazole → HCID 67006822, compound

Participants

Reaction Steps

N′-((2R,3S)-2-(3-chloro-4-cyano-2-methylphenylamino)-3-hydroxybutanoyl)-4-fluoro benzohydrazide (15.2 g, 38.0 mmol) was protected using TBDMSCl (11.32 g, 75.0 mmol) and imidazole (10.23 g, 150 mmol) in a manner analogous to that described for the preparation of intermediate 7b. Purification of the compound was accomplished by pouring the reaction mixture into ice-cold water (1.6 L) and filtering off the solid precipitate. This was taken up in methylene chloride (700 mL) and sequentially washed with water (2×200 mL) and brine (1×200 mL). This was then dried over sodium sulfate, filtered and concentrated down to give a yellow solid. After column chromatography (50% EtOAc/hexanes) the title compound was isolated as a white solid (20 g, quant.). 1H NMR (400 MHz, CDCl3, δ in ppm) 9.32 (m, 2H), 7.77 (dd, J=5.3, 8.8 Hz, 2H), 7.27 (d, J=8.7 Hz, 1H), 7.05 (t, J=8.6 Hz, 2H), 6.54 (d, J=8.7 Hz, 1H), 4.94 (d, J=6.0 Hz, 1H), 4.36 (m, 1H), 4.01 (t, J=5.3 Hz, 1H), 2.26 (s, 3H), 1.35 (d, J=6.4 Hz, 3H), 0.89 (s, 9H), 0.14 (s, 3H), 0.09 (s, 3H).

Provenance & Evidence