Water → (Z)-5-amino-1,3-dihydro-4-(6-indolyl)-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-2H-indol-2-one

Participants

Reaction Steps

To a solution of (Z)-1,3-dihydro-4-(6-indolyl)-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-5-nitro-2H-indol-2-one (48 mg, 0.12 mmol) (from Step A above) in 2 mL of a 10% water in methanol solution and 0.5 mL THF was added zinc dust (70 mg, 1.07 mmol) followed by ammonium chloride (19 mg, 0.36 mmol). The reaction was heated at gentle reflux for 4 hours, at which time the reaction mixture was filtered through a pad of Celite® and rinsed thoroughly with ethyl acetate. The resulting solution was diluted with 5 mL water and the product was extracted with ethyl acetate. The combined organic extracts were dried over magnesium sulfate and concentrated. The resulting powder was recrystallized from EtOAc/hex to yield 25 mg (57%) of (Z)-5-amino-1,3-dihydro-4-(6-indolyl)-3-[(3-methoxy-1H-pyrrol-2-yl)methylene]-2H-indol-2-one as a red powder.

Provenance & Evidence