Potassium Cyanide → (Z)-1,3-dihydro-4-ethynyl-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-2H-indol-2-one

Participants

Reaction Steps

Using Method K above, a solution of (Z)-1,3-dihydro-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-4-(2-trimethylsilyl-ethynyl)-2H-indol-2-one (1.3 g, 3.86 mmol) (from Step 1 above) in EtOH (80 mL) was treated with AgNO3 (1.46 g, 8.59 mmol) in ethanol (5 mL) and water (15 mL) at room temperature for 1 h followed by KCN (2.71 g, 41.6 mmol) in water (10 mL) to give (Z)-1,3-dihydro-4-ethynyl-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-2H-indol-2-one. (Yield 1.02 g, 100%).

Provenance & Evidence