construction of tetrahydropyrans derived from readily available 1,2-dioxines containing a tethered hydroxyl moiety is described. The reaction proceeds via a base-catalyzed rearrangement of the 1,2-dioxines to either the isomeric cis or trans γ-hydroxy enones followed by intramolecular oxa-Michael addition of the tethered hydroxyl group.
描述了一种新的构建
四氢吡喃的方法,该
四氢吡喃衍生自易于获得的含有束缚的羟基部分的1,2-二恶英。该反应通过将1,2-二恶英经碱催化重排成异构体顺式或反式γ-羟基烯酮,然后通过分子内的氧杂-Michael加成束缚的羟基而进行。