A collection of pyrano[3,2-c] chromene, 4H-chromene and 4H-pyran were synthesized in excellent yield employing an innocuous, inexpensive and naturally occurring borax-catalyzed multicomponent domino reaction. The present protocol offers advantages in terms of higher yields, short reactions time and no workup and no column chromatography.
A. Molla, E. Hossain and S. Hussain, RSC Adv., 2013, 3, 21517 DOI: 10.1039/C3RA43514H
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