反应详情

A mixture of 3-iodo-5-methoxycarbonyl-1-triisopropylsilylpyrrole (1.222 g, 3.0 mmol), 2-pivaloylamino-4-hydroxy-6-ethynylpyrido[2,3-d]pyrimidine (0.851 g, 3.15 mmol), Pd(PPh)2C12 (105 mg, 0.15 mmol), cuprous iodide (2 g mg, 0.15 mmol), and triethylamine (0.5 mL) in acetonitrile (50 mL) was heated at reflux for 4 hours. The resulting solution was cooled, filtered, and concentrated in vacuo. The residue was purified by flash chromatography, eluting with hexanes:ethyl acetate(2:1). The first major fraction is unchanged starting material (270 mg, 32%); the subsequent major fluorescent fractions were combined and concentrated in vacuo to give methyl 4-[2-(2-pivaloylamino-4-hydroxypyrido[2,3-d]pyrimidin-6-yl)ethynyl]1-triisopropylsilylpyrrole-2-carboxylate as a pale yellow solid (935 mg, 57%, mp 163-165° C.): 1H NMR (CDCl3) δ 8.90 (br s, 1H), 8.52 (d, 1H, J=2.4 Hz), 7.35 (d, 1H, J=1.4 Hz), 7.23 (d, 1H, J=1.4 Hz), 3.79 (s, 3H), 1.75 (sept, 3H, J=7.6 Hz), 1.31 (s, 9H), 1.10(d, 18H, J=7.6 Hz).

1. temperaturewas heated
2. temperatureat reflux for 4 hours
3. temperatureThe resulting solution was cooled
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customThe residue was purified by flash chromatography
7. washeluting with hexanes:ethyl acetate(2:1)
8. concentrationconcentrated in vacuo