作者:Jürgen Sauer、Dieter K. Heldmann、Klaus-Jürgen Range、Manfred Zabel
DOI:10.1016/s0040-4020(98)00754-6
日期:1998.10
inverse type [4+2] cycloadditions with various 1,3,4-oxadiazin-6-ones to afford two regioisomeric stannylated α-pyrones, which can be separated by flash column chromatography. Exposure of the stannanes to elemental halogens in chloroform or THF as solvent yields the corresponding halogeno pyrones. A general exception of this reaction type is also described. Destannylation with dry hydrogen chloride furnishes
乙炔基三丁基锡与各种1,3,4-恶二嗪-6-酮进行逆型[4 + 2]环加成反应,得到两个区域异构的甲锡烷基化的α-吡喃酮,可通过快速柱色谱分离。将锡烷暴露于氯仿或THF中作为溶剂的元素卤素中,得到相应的卤代吡喃酮。还描述了该反应类型的一般例外。用干燥的氯化氢去甲锡烷基化可提供3,6-二取代的α-吡喃酮。