A copper(II)-P,N,N-ligand catalyzed propargylic [3 + 2] cycloaddition approach for the synthesis of optically enriched dihydrofuro[3,2-c]coumarins has been accomplished for the first time. The cycloaddition utilizes propargylic esters as C2-bis-electrophiles… Click to show full abstract
A copper(II)-P,N,N-ligand catalyzed propargylic [3 + 2] cycloaddition approach for the synthesis of optically enriched dihydrofuro[3,2-c]coumarins has been accomplished for the first time. The cycloaddition utilizes propargylic esters as C2-bis-electrophiles and 4-hydroxycoumarin derivatives as C,O-bis-nucleophiles. In addition, this novel strategy was also explored with 4-hydroxy-2-quinolinones and 4-hydroxythiocoumarins. Moreover, various dihydrofuro[3,2-c]coumarins and their quinolinone and thiocoumarin analogues were synthesized in moderate to good yields with high enantioselectivities.
Journal Title: Organic letters
Year Published: 2023
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