反应详情

Using Method L above, (Z)-5-[2,3-dihydro-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-5-nitro-2-oxo-1H-indol-4-yl]-4-pentynoic acid methyl ester (0.22 g, 0.57 mmol) (from Example 35 above) was reduced with zinc (0.33 g, 5.1 mmol) and ammonium chloride (67.1 mg, 1.25 mmol) in 10% water in methanol (20 mL) with heating at reflux for 4 h to give (Z)-5-[5-amino-2,3-dihydro-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-2-oxo-1H-indol-4-yl]-4-pentynoic acid methyl ester (Yield 0.1 g, 48%).

1. temperaturewith heating
2. temperatureat reflux for 4 h