Leucine: green and efficient catalyst for the synthesis of 4H-chromenes
DOI:
https://doi.org/10.24297/jac.v10i9.6168Keywords:
4H-chromene-3-carbonitrile, leucine, malononitrile, dimedone, one-pot condensationAbstract
Leucine, a naturally occurring α-amino acid, has been found as an effective catalyst to effect the one-pot three-component condensation reaction between aromatic aldehydes, malononitrile and 5,5-dimethyl-1,3-cyclohexanedione (dimedone). Various 2-amino-4-aryl-7,7-dimethyl-5-oxo-5,6,7,8-tetrahydro-4H-chromene-3-carbonitrile derivatives are conveniently prepared by these reactions in excellent yields. High yields, short reaction times, simple work-up, use of green and naturally occurring catalyst and solvent are the main merits of the present protocol.
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