Stereoselective Synthesis of Tetrahydropyran-4-ones from Dioxinones Catalyzed by Scandium(III) Triflate
作者:William J. Morris、Daniel W. Custar、Karl A. Scheidt
DOI:10.1021/ol050093v
日期:2005.3.1
[reaction: see text] A scandium triflate catalyzed, diastereoselective cyclization between aldehydes and beta-hydroxy dioxinones has been discovered. This process capitalizes on the untapped nucleophilicity of the embedded enol ether within the dioxinone core. The bicyclic compounds from the resulting cyclization can be isolated, or alternatively, alkoxide nucleophiles can be directly added. This in
[反应:见正文]已发现三氟甲磺酸scan催化醛与β-羟基二恶英酮之间的非对映选择性环化。该过程利用了二恶英酮核心中嵌入的烯醇醚的未开发的亲核性。可以从所得环化反应中分离出双环化合物,或者可以直接添加醇盐亲核试剂。该原位加成使二恶英酮环断裂,并以高收率和高非对映选择性递送3-羧基取代的四氢吡喃-4-酮。