An Efficient Synthesis of 6H,7H-Chromeno[4,3-b]chromenes and 6,7-Dihydrothiochromeno[3,2-c]chromenes as 9-Substituted Xanthene Like Analogues.

2012

The reaction of aldehyde substrates with Grignard reagents is followed by Friedel—Crafts cyclization to produce biologically interesting scaffolds.

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