Epoxidation of 4-Alkylidenecyclopentenones: A Route to the 1-Oxaspiro[2.4]hept-6-en-5-one Framework

[摘要]：Thanks to their lack of polarity, the exocyclic double bonds of 4-alkylidenecyclopentenones 4 are selectively epoxidized by MCPBA to give spiroepoxycyclopentenones 7, which feature the nonclassical 1-oxaspiro[2.4]hept-6-en-5-one framework. Under acidic conditions, compounds 7 undergo ring-opening to afford 4-hydroxy-4-(1-hydroxyalkyl)cyclopentenones 10.

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