反应详情

温度

160 °C

A mixture of methyl 5-chloropyrazine-2-carboxylate (60.1 mg, 0.348 mmol), 4-hydroxy-2,2-dimethyl-2,3-dihydro-benzofuran-6-carboxylic acid (1-methyl-1H-pyrazol-3-yl)-amide (31a) (100 mg, 0.348 mmol) and Cs2CO3 (227 mg, 0.696 mmol) in DMF was heated to 160° C. in a microwave for 30 min, cooled to room temperature, quenched with H2O and extracted with 3×EtOAc. The combined organic layer was washed with 2×H2O, dried over Na2SO4 and concentrated. The residue was purified by column chromatography eluting with 45% to 70% EtOAc in hexanes to give a colorless thick oil (71 mg, 48% yield). 1H NMR (400 MHz, CDCl3) δ 8.94 (s, 1 H) 8.85 (d, J=1.01 Hz, 1 H) 8.52 (d, J=1.26 Hz, 1 H) 7.27 (d, J=2.27 Hz, 1 H) 7.21 (s, 1 H) 7.15 (s, 1 H) 6.80 (d, J=2.02 Hz, 1 H) 4.03 (s, 3 H) 3.74 (s, 3 H) 2.86 (s, 2 H) 1.49 (s, 6 H); LCMS for C21H21N5O5 m/z 424.20 (M+H+).

1. temperaturecooled to room temperature
2. customquenched with H2O
3. extractionextracted with 3×EtOAc
4. washThe combined organic layer was washed with 2×H2O
5. dry with materialdried over Na2SO4
6. concentrationconcentrated
7. customThe residue was purified by column chromatography
8. washeluting with 45% to 70% EtOAc in hexanes