Herein we describe compositions and methods for the synthesis of [2.2.2]-diazabicyclic structures comprising a domino reaction sequence involving aldol condensation, alkene isomerization, and intramolecular hetero-Diels-Alder cycloaddition. Excellent diastereofacial control during the cycloaddition is enforced with a removable chiral phenyl aminal diketopiperazine substituent. The reaction sequence rapidly generates molecular complexity and is competent with both enolizable and non-enolizable aldehyde substrates. This method provides an efficient route to [2.2.2]-diazabicyclic structures, common to bioactive prenylated indole alkaloids such as the brevianamides and stephacidins.
在这里,我们描述了一种合成[2.2.2]-二
氮杂双环结构的组合物和方法,包括一个多米诺反应序列,涉及醛缩合、
烯烃异构化和分子内杂Diels-Alder环加成。在环加成过程中,采用可移除的手性
苯基胺基二
酮肽取代基强制实现了优异的对映面控制。该反应序列快速生成分子复杂性,并适用于既可
烯化又不可
烯化的醛基底物。这种方法提供了一种有效的合成途径,用于制备[2.2.2]-二
氮杂双环结构,这些结构常见于
生物活性的类似于百里
酰胺和司法酸的前尼双环
吲哚生物碱。