A novel α,β-unsaturated nitrone-aryne [3+2] cycloaddition and its application in the synthesis of the cortistatin core
作者:Mingji Dai、Zhang Wang、Samuel J. Danishefsky
DOI:10.1016/j.tetlet.2008.09.019
日期:2008.11
We describe here a novel alpha,beta-unsaturated nitrone-aryne [3+2] cycloaddition. The resulting benzoisoxazolines underwent N-O bond reduction-elimination-electrocyclization sequence to furnish a variety of polysubstituted 2H or 2-alkylated-1-benzo-pyrans. The application of this methodology was further demonstrated in the synthesis of the oxa[3.2.1]octene moiety of cortistatin A.
我们在这里描述了一种新型的 α、β-不饱和硝酮-芳烃 [3+2] 环加成反应。所得苯并异恶唑啉经历 NO 键还原-消除-电环化序列,以提供各种多取代的 2H 或 2-烷基化-1-苯并-吡喃。这种方法的应用在皮质抑素 A 的 oxa[3.2.1] 辛烯部分的合成中得到了进一步证明。