Stereoselective Construction of <i>cis</i>-2,6-Disubstituted Tetrahydropyrans <i>via</i> the Reductive Etherification of δ-Trialkylsilyloxy Substituted Ketones: Total Synthesis of (−)-Centrolobine
作者:P. Andrew Evans、Jian Cui、Santosh J. Gharpure
DOI:10.1021/ol035438t
日期:2003.10.1
[reaction: see text] The stereoselective intramolecular reductive etherification of delta-trialkylsilyloxy substituted ketones with catalytic bismuth tribromide and triethylsilane provides a convenient method for the construction of cis-2,6-disubstituted tetrahydropyrans. This method was highlighted in the key step of an expeditious total synthesis of the antibiotic, (-)-centrolobine.
[反应:见正文]δ-三烷基甲硅烷氧基取代的酮与催化三溴化铋和三乙基硅烷的立体选择性分子内还原醚化为构建cis-2,6-二取代的四氢吡喃提供了一种方便的方法。快速合成抗生素(-)-centrolobine的关键步骤突显了该方法。