Development of a divergent synthesis of 4- and 5-membered heterocycles and its application to the synthesis of bioactive natural product

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Heterocyclic compounds are utilized in pharmaceuticals, agrochemicals and functional materials. Recently, oxygen-containing 4-membered heterocycles, oxetane, has been reported as a useful skeleton to improve a pharmaceutical quality. We developed a facile oxetane synthesis using O,P-acetal consisted of phosphorous and oxygen as a key intermediate. The feature of this method is eco-conscious double use of phosphorous atom in one reaction. We also succeeded in synthesizing natural product having anticancer activity in short steps using our method.