反应详情

To a 100 mL 14/20 round bottom flask under an argon atmosphere were added 0.316 g (1.17 mmol) of 2 -pivaloylamino-4-hydroxy-6-ethynylpyrido[2,3-d]pyrimidine suspended in 10 mL of acetonitrile, followed by the addition of 0.47 g (1.2 mmol) of diethyl N-(2-bromo-4-thiazolylcarbonyl)-L-glutamate, 0.14 g (0.12 mmol) of tetrakis(triphenylphosphine)palladium (0), 0.046 g (0.24 mmol) of copper (I) iodide, and 0.35 mL (2.5 mmol) of triethylamine with an additional 10 mL of acetonitrile. The reaction was heated to reflux for 2 hours The volatiles were removed in vacuo, and the residue purified using silica gel flash chromatography, eluting with a step gradient of 100% chloroform to 2% methanol/chloroform to give 0.46 g (67%) of diethyl N-{2-[2-pivaloylamino-4-hydroxypyrido[2,3-d]pyrimidin-6-ylethynyl]-4-thiazolylcarbonyl}-L-glutamate as an off-white solid, m.p. 201-202° C. (dec). Rf =0.28 (4% methanol/chloroform). 1H NMR (300 MHz, DMSO-d6) δ 1.12-1.29 (m, 15H), 2.05-2.15 (m, 1H), 2.37 (t, J=7.2 Hz, 2H), 3.98-4.13 (m, 4H), 4.45-4.49 (m, 1H), 8.47 (s, 1H), 8.61 (d, J=1.8 Hz, 1H), 8.84 (d, J=8.1 Hz, 1H), 9.07 (d, J=1.9 Hz, 1H)

1. temperatureThe reaction was heated
2. temperatureto reflux for 2 hours The volatiles
3. customwere removed in vacuo
4. customthe residue purified
5. washeluting with a step gradient of 100% chloroform to 2% methanol/chloroform