An atom-economical synthesis of spironaphthoquinolines from a mixture of 2-aminoanthracene, aldehyde and a Knoevenagel condensation product was developed. The association of the method with the use of ultrasound and its procedural simplicity makes it an attractive protocol for the formation of novel and important heterocycles.
M. M. Sarmah, S. Borthakur, D. Bhuyan and D. Prajapati, RSC Adv., 2015, 5, 68839 DOI: 10.1039/C5RA13793D
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