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A K2CO3-catalyzed cycloaddition constructs chromeno[2,3-b]chromenes from para-quinone methides and 3-cyanochromones, indicating broad substrate potential.
A K 2 CO 3 -catalyzed [4 + 2] cycloaddition of ortho -hydroxyphenyl- p -QMs with 3-cyanochromones has been developed that rapidly constructs chromeno[2,3- b ]chromene skeletons, featuring a broad substrate scope and 100% atom economy.
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Qiao et al. (2025) studied this question.
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