Résumé
The results reported in this study provide a practical protocol for the construction, in one single step of synthetically important y-lactones in good yields starting from a-hydroxy cyclobutanone, H2O2 and sev-eral stabilized phosphonium ylides. Our synthetic strategy relies on a tandem Baeyer-Villiger oxidation/ Wittig reaction/oxa-Michael addition. & COPY; 2023 Elsevier Ltd. All rights reserved.