Thermal Rearrangement of Nitrone and Nitrile Oxide Cycloadducts to Bicyclopropylidene.<sup>1</sup> Synthesis of 3-Spirocyclopropane-4-pyridone and Furo[2,3-<i>c</i>]pyridine Derivatives
作者:Andrea Goti、Beatrice Anichini、Alberto Brandi、Sergei Kozhushkov、Corinna Gratkowski、Armin de Meijere
DOI:10.1021/jo951838l
日期:1996.1.1
The same sequence of cycloaddition and rearrangement can be achieved in a "one-pot" operation with considerable benefit for the reaction yield. Bisspirocyclopropaneisoxazolines obtained from nitrile oxides are more stable than their saturated counterparts and rearrange only at higher temperature less chemoselectively. Opening of both spiro-fused cyclopropylrings followed by aromatization produces interesting