Diastereoselective syntheses of substituted cis-hydrindanones featuring sequential inter- and intramolecular Michael reactions
作者:Junjia Liu、Maurice A. Marsini、T. Aaron Bedell、Paul J. Reider、Erik J. Sorensen
DOI:10.1016/j.tet.2016.03.039
日期:2016.6
substituted cis-1-hydrindanones enabled by a sequence of Michael reactions. A copper-catalyzed intermolecular Michael addition of a cyclic silyl ketene acetal to a β-substituted-α-alkoxycarbonyl-cyclopentenone enables construction of a quaternary center and is followed, after incorporation of an additional Michael acceptor, by a second, intramolecular addition of a nucleophilic β-ketoester. This strategy affords
在许多天然产物中,氢杂环丙烷(双环[4.3.0]壬烷)的结构基序(1)和相关的顺式-1-羟基丹酮骨架(2)是常见的亚结构。在本文中,我们描述了通过一系列迈克尔反应实现对取代的顺式-1-氢醌的有效访问。铜催化的将环状甲硅烷基乙烯酮缩醛的分子间迈克尔加成至β-取代的α-烷氧基羰基-环戊烯酮使得能够构建季中心,并且在引入另外的迈克尔受体之后,第二次分子内加成α亲核性β-酮酸酯。该策略提供对取代的双环顺式的立体选择-氢丹酮环系统最多包含三个连续的立体中心。