Nazarov cyclisation of dienone-esters and tetrahydropyrones using trimethylsilyltriflate

Article abstract of DOI:10.1016/0040-4039(91)80577-S

Cyclopentenone esters have been synthesized via a Nazarov cyclisation of the corresponding α,α'-dienone esters or tetrahydro-γ-pyrone esters employing trimethylsilyltriflate at room temperature. The dienone esters were synthesised by a short two-step acylation-Knoevenagel sequence.