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Diverse chromenones were synthesized through tunable phosphine‐mediated cascade reactions between 3‐acyl‐2H‐chromen‐2‐ones and Morita–Baylis–Hillman (MBH) derivatives. With different phosphine loadings and reaction temperatures, MBH derivatives act either as C1 or C3 synthons for the construction of potential biologically active 3‐dihydrofuran‐fused chromen‐2‐ones, 4‐allyl‐3‐acyl‐chromen‐2‐ones, or...
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