AB u 3 P-mediated cyclization reaction of 3-cinnamoyl-4-hydroxy-2H-chromen-2-ones though electrophilic addition of acyl chlorides towards the synthesis of highly functionalizedf uro[3,2-c]coumarins bearing ap hosphorus ylide moiety is described. These unprecedented cyclization reaction proceeds under mild reaction conditions within short reaction times (1 min to 1h), and can be further applied in the synthesis of alkenyl-substituted furo [3,2-c]coumarins by the treatment with carbonyl electrophiles under basic conditions.
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