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A strategically new approach to cyclopentene[c]chroman-2-ones and cyclopent-1-enecarboxylates by tandem Michael-Horner-Wadsworth-Emmons reaction of 2,5-hexanedione with 3-(diethoxyphosphoryl)coumarins is described. The products were obtained as single diastereoisomers in high yields.doi:10.1055/s-0033-1340347 fatcat:hakxzrvj3fdovovgkjugvpgxp4