Diisopropylethylamine → 1,1-dimethylethyl {(1R)-1-[1-({3,4-difluoro-2-[(2-fluoro-4-iodophenyl)amino]phenyl}carbonyl)-3-hydroxyazetidin-3-yl]ethyl}carbamate

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Reaction Steps

To a solution of 1,1-dimethylethyl [(1R)-1-(3-hydroxyazetidin-3-yl)ethyl]carbamate (200 mg, 0.92 mmol) in dichloromethane (5 mL) was added diisopropylethylamine (228 μL, 1.38 mmol) and 3,4-difluoro-2-[(2-fluoro-4-iodophenyl)amino]benzoyl fluoride (prepared according to the procedures described in Reference 1) (363 mg, 0.92 mmol). The mixture was stirred at rt for 16 h, after which the volatile materials were removed in vacuo. The residue was purified by column chromatography (50% hexanes:50% ethyl acetate) to provide 1,1-dimethylethyl {(1R)-1-[1-({3,4-difluoro-2-[(2-fluoro-4-iodophenyl)amino]phenyl}carbonyl)-3-hydroxyazetidin-3-yl]ethyl}carbamate as a colorless film (333 mg, 0.56 mmol, 61% yield). 1H NMR (400 MHz, CDCl3) δ 8.47 (br s, 1H), 7.40 (dd, 1H), 7.32 (d, 1H), 7.12 (m, 1H), 6.81 (m, 1H), 6.61 (m, 1H), 4.74 (br d, 1H), 4.22 (d, 1H), 4.15-4.07 (m, 2H), 3.96 (br s, 1H), 3.77 (m, 1H), 1.43 (s, 9H), 1.18 (d, 3H); MS (EI) for C23H25F3IN3O4: 536 (M−tert-butyl+H).

Provenance & Evidence