Diisopropylethylamine → 9H-fluoren-9-ylmethyl [2-({6-cyano-5-[(4,6-dimethylpyridin-2-yl)amino]pyridin-3-yl}amino)-2-oxoethyl]carbamate

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Reaction Steps

To a solution of 5-amino-3-[(4,6-dimethylpyridin-2-yl)amino]pyridine-2-carbonitrile (PrepEx 1.8) (100 mg, 0.418 mmol), 9H-fluoren-9-ylmethyl (2-chloro-2-oxoethyl)carbamate (264 mg, 0.835 mmol), and diisopropylethylamine (0.15 mL, 0.84 mmol) in DMF (3.2 mL) at 0° C. was added 1-propanephosphonic acid cyclic anhydride (50% solution in ethyl acetate, 0.29 mL, 0.50 mmol). The reaction mixture was stirred for 2 hours while warming to room temperature. The reaction mixture was diluted with ethyl acetate and washed with sodium hydroxide (1.0 M in water). The organics were dried over magnesium sulfate, filtered, and concentrated under reduced pressure. Dichloromethane (3 mL) was slowly added, and the precipitated solids were filtered and collected to afford 9H-fluoren-9-ylmethyl [2-({6-cyano-5-[(4,6-dimethylpyridin-2-yl)amino]pyridin-3-yl}amino)-2-oxoethyl]carbamate. MS ESI calc'd for C30H27N6O3 [M+H]+ 519. found 519. 1H NMR (500 MHz, DMSO-d6) δ 10.54 (s, 1H), 9.09 (s, 1H), 8.78 (d, J=2.0 Hz, 1H), 8.39 (d, J=2.1 Hz, 1H), 7.88 (d, J=7.5 Hz, 2), 7.75-7.65 (m, 3H), 7.40 (t, J=7.4 Hz, 2H), 7.31 (t, J=7.4 Hz, 2H), 6.65 (s, 1H), 6.61 (s, 1H), 4.29 (d, J=7.0 Hz, 2), 4.24-4.20 (m, 1H), 3.84 (d, J=6.1 Hz, 2H), 2.28 (s, 3H), 2.20 (s, 3H).

Provenance & Evidence