Divergent and Concise Syntheses of Spiroisoxazolines: First Total Synthesis of 11-Deoxyfistularin-3
作者:Prasanta Das、Ashton T. Hamme II
DOI:10.1002/ejoc.201500603
日期:2015.8
A divergent and concise base-promoted Dieckmann-type keto-ester condensation strategy is demonstrated to generate two unique spiro[cyclohexadiene-isoxazoline] moieties. The consecutive di-bromination–elimination–bromination of the corresponding spiro moiety has been successfully utilized to furnish the desired core structure of many bromotyrosine derived spiroisoxazoline natural products. The spiroisoxazoline
证明了一种发散且简洁的碱促进 Dieckmann 型酮酯缩合策略可生成两个独特的螺[环己二烯-异恶唑啉]部分。相应螺部分的连续二溴化-消除-溴化已成功用于提供许多溴酪氨酸衍生的螺异恶唑啉天然产物所需的核心结构。螺异恶唑啉酸进一步与所需的二胺偶联以完成 11-deoxyfistularin-3 的首次全合成。该策略可以作为先前开发的苯酚氧化脱芳构化螺环化的有效替代方案,作为合成此类天然产物的必要步骤。