Diastereoselective oxygen to carbon rearrangements of anomerically linked enol ethers and the total synthesis of (+)-(S,S )-(cis-6-methyltetrahydropyran-2-yl)acetic acid, a component of civet
作者:Darren J. Dixon、Steven V. Ley、Edward W. Tate
DOI:10.1039/b001243m
日期:——
range of enol ethers, linked via their oxygen atom to the anomeric centre of a pyran ring system, was shown to undergo oxygen to carbon rearrangement upon treatment with a Lewis acid to give the corresponding 2-carbon substituted products. At low temperature, trimethylsilyl trifluoromethanesulfonate catalysed rearrangements of anomerically linked 6-substituted tetrahydropyranyl enol ethers gave selectively
范围 烯醇醚,通过其氧原子连接至a的异头中心吡喃环经显示,在用路易斯酸处理后,该体系经历了氧至碳的重排,从而给出了相应的2-碳取代的产物。在低温下三甲基甲硅烷基三氟甲磺酸盐芳基连接的6-取代的四氢吡喃基烯醇醚的催化重排选择性产生了反式-吡喃基酮类,而在较高温度下,顺式-吡喃基的选择性形成酮类被观测到。在该方法的简单应用中,顺式-选择性重排被用作灵巧成分的简明总合成中的关键步骤。