Phthalic Acid → 2-(1H-Indazol-3-yl)-1H-isoindole-1,3(2H)-dione

Participants

Reaction Conditions

Reaction Steps

5.0 g of the same 3-aminoindazole as Example 1 and 6.68 g of phthalic acid were added to 50 ml of dioxane, and the mixture was stirred for 5 hours at 120° C. The mixture was condensed under reduced pressure, 30 ml of diethyl ether was added and the mixture was stirred under cooling with ice and water for 30 minutes to separate crystals. The crystals were obtained by filtration and dried under reduced pressure to give 8.6 g of 3-phthalimidoindazole in a yield of 87%.

Provenance & Evidence