An efficient synthetic approach for the synthesis of α-pyrones via Baeyer–Villiger-type oxidation of α-iodocyclopentenones through a catalyst- and additive-free system using air as an environmentally benign oxidant is described. The reaction exhibits excellent functional group compatibility and provides a simple and efficient protocol for the construction of highly functionalized α-pyrones under mild reaction conditions.
Catalyst- and additive-free Baeyer–Villiger-type oxidation of α-iodocyclopentenones to α-pyrones: using air as the oxidant†
Weidong Rao 
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