Efficient synthesis of bis-indolyloxindoles from (phenylimino)indolin-2-ones and 1H-indole catalyzed by p-toluenesulfonic acid

详细

p-Toluenesulfonic acid (p-TSA) efficiently catalyzed the reaction of (phenylimino)indolin-2-ones with 1H-indole in dichloromethane at room temperature to afford 3,3-di(indolyl)indolin-2-ones in 2-3 min with high yields.