Abstract
A multicomponent pathway has been described for the synthesis of novel pyrano (3,2-c) quinolone fused spirochromenes by piperidine catalyzed reaction between isatins, phenyl (or alkyl) sulfonyl acetonitrile and 4-hydroxy-N-methylquinoline-2-one. Decent yields coupled with easy isolation of the products and avoidance of conventional purification methods are the noteworthy merits of the developed protocol.
Acknowledgements
I acknowledge my sincere thanks to my research supervisor Prof. U. V. Desai for his continuing support and Shivaji University, Kolhapur (MS), India.
Disclosure statement
No potential conflict of interest was reported by the authors.