Popis: |
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 6H-benzo[c]chromen-6-ones. This method has the advantages of mild conditions, simple workup, and wide substrate scope, which make it powerful for the synthesis of diverse chromenone derivatives. |