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Efficient electrophilic substitution reaction of indoles with various aromatic aldehydes were carried out with a catalytic amount of sodium hydrogensulfate monohydrate (NaHSO4.H2O) in ionic liquid n-butylpyridinium tetrafluoroborate ([Bpy]BF4) to afford the corresponding bi(indolyl)methanes in excellent yields. The notable advantages of this protocol in terms of low cost of catalyst and ionic liquid, mild conditions, simple operation, short reaction time, high yields and recycling of the ionic liquid.
Efficient electrophilic substitution reaction of indoles with various aromatic aldehydes were carried out with a catalytic amount of sodium hydrogensulfate monohydrate (NaHSO4.H2O) in ionic liquid n-butylpyridinium tetrafluoroborate ([Bpy] BF4) to afford the corresponding bi (indolyl) methanes in excellent yields. The notable advantages of this protocol in terms of low cost of catalyst and ionic liquid, mild conditions, simple operation, short reaction time, high yield and recycling of the ionic liquid.