反应详情

5-Bromo-1H-pyrrole-2-carboxylic acid methyl ester (1.49 mmol, 0.30 g, prepared according to the procedure described in Method 4 of Example 2) in NMP (10 ml) was treated with triphenylarsine (0.30 mmol, 91 mg), tris(dibenzylideneacetone) dipalladium(0) (0.07 mmol, 68 mg), and 4-(trimethylstannyl)-isoquinoline (2.22 mmol, 0.65 g), then heated to reflux under an argon atmosphere overnight. The resulting mixture was concentrated under reduced pressure, then purified by silica gel chromatography to provide 0.21 g (55%) of 5-isoquinolin-4-yl-1H-pyrrole-2-carboxylic acid methyl ester. 1H NMR (CDCl3) δ9.81 (1H, br s), 9.35 (1H, s), 8.66 (1H, s), 8.31 (1H, d, J=8.5), 8.10 (1H, d, J=8.1), 7.91 (1H, t, J=15.2), 7.79 (1H, t, J 15.2), 7.11 (1H, dd, J=3.8, 2.5), 6.64 (1H, dd, J=3.7, 2.7), 3.90 (3H, s).

1. temperatureheated
2. temperatureto reflux under an argon atmosphere overnight
3. concentrationThe resulting mixture was concentrated under reduced pressure
4. custompurified by silica gel chromatography