Stannylated α-pyrones: Synthesis, halogenation and destannylation reactions
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 hydrogenchloride furnishes