Abstract
An efficient catalyst-free synthesis of novel pentacyclic thiochromone-annulated thiopyranocoumarin derivatives is achieved via domino Knoevenagel-hetero-Diels–Alder reaction of 4-hydroxy dithiocoumarin and O-acrylated salicylaldehyde derivatives in H 2O as solvent. The products are formed in good yields with high regio- and stereo-selectivity.
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