反应详情

温度

80 °C

A mixture of tert-butyl 5-iodo-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-pyrazol-4-ylcarbamate (390.7 mg, 0.8892 mmol), 5-chloro-2-methoxy-pyridine-3-boronic acid pinacol ester (364.0 mg, 1.350 mmol), tris(dibenzylideneacetone)dipalladium(0) chloroform adduct (48.5 mg, 0.0468 mmol), S-Phos (74.2 mg, 0.181 mmol), potassium phosphate (597.1 mg, 2.813 mmol), and 1-butanol (10 mL) was degassed with nitrogen and then stirred at 80° C. for 15 hours. The reaction mixture was diluted in ethyl acetate, washed with water and brine, dried over magnesium sulfate, filtered, and evaporated in vacuo. The crude product was purified via flash chromatography on silica gel (0 to 50% ethyl acetate in heptanes) to yield 212.3 mg (52%) of tert-butyl 5-(5-chloro-2-methoxypyridin-3-yl)-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-pyrazol-4-ylcarbamate. LCMS (ESI) m+H=455.2; 1H NMR (400 MHz, DMSO-d6) δ: 8.53 (s, 1H), 8.33 (s, 1H), 7.79 (d, J=2.6, 1H), 5.22 (s, 2H), 3.85 (s, 3H), 3.35 (t, 2H), 1.38 (s, 9H), 0.70 (t, J=8.1, 2H), −0.10 (s, 9H).

1. customwas degassed with nitrogen
2. additionThe reaction mixture was diluted in ethyl acetate
3. washwashed with water and brine
4. dry with materialdried over magnesium sulfate
5. filtrationfiltered
6. customevaporated in vacuo
7. customThe crude product was purified via flash chromatography on silica gel (0 to 50% ethyl acetate in heptanes)