Abstract
AbstractThe construction of benzopyrone‐fused hydrobenzofuranones via DABCO‐catalyzed [3+2] cyclization/deformylation cascade of p‐quinols with 3‐formylchromones is described. The reaction works under mild reaction conditions to provide the desired products in 53–90% yields with complete diastereoselectivities. In addition, an enantioselective version with 81% ee is also realized in the presence of Takemoto's chiral thiourea catalyst.magnified image
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