Two mild and efficient strategies have been developed for the O-functionalisation of 4-hydroxy-6-alkyl-2-pyrones, by using them as nucleophilic partners in oxa-Michael additions and the Mitsunobu reaction. The reactions proceed in moderate to excellent yields on a range of substrates containing useful functionality. The reactions serve as practical and valuable synthetic methods to construct complex 2-pyronyl ethers, which are found embedded in a number of natural products.
已开发了两种温和高效的策略,用于将4-羟基-6-烷基-2-吡喃烯氧化功能化,通过将它们用作氧杂Michael加成和三冈反应中的亲核试剂。这些反应在包含有用官能团的一系列底物上以中等至优良的产率进行。这些反应作为实用且有价值的合成方法,用于构建复杂的2-吡喃醚,这些醚嵌入在许多天然产物中。