https://www.selleckchem.com/pr....oducts/Gefitinib.htm
Intermolecular [2+2] photocycloadditions represent a powerful method for the synthesis of highly strained, four-membered rings. Although this approach is commonly employed for the synthesis of oxetanes and cyclobutanes, the synthesis of azetidines via intermolecular aza Paternò-Büchi reactions remains highly underdeveloped. Here we report a visible-light-mediated intermolecular aza Paternò-Büchi reaction that utilizes the unique triplet state reactivity of oximes, specifically 2-isoxazoline-3-carboxylates. The reactivity of this class
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