Enyne diketones as substrate in asymmetric Nazarov cyclization for construction of chiral allene cyclopentenones.

Enyne diketones as substrate in asymmetric Nazarov cyclization for construction of chiral allene cyclopentenones.
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DOI:
10.1038/s41467-022-30846-y
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发表时间:
2022-06-07
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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Nazarov环化反应是立体选择性合成各种环戊烯酮骨架的最有力的工具之一。因此,开发新的Nazarov反应底物是合成化学中的一个重要奋进。在此,我们报告烯炔二酮,使非对映体和对映体选择性建设的手性丙二烯环戊烯酮在中等到良好的产率与良好的对映体选择性(高达97%ee)。重要的是,它是使用Nazarov环化不对称合成具有丙二烯部分的环戊酮的典型实例。机理研究表明,金属-有机中继催化反应包括铑催化的串联氧鎓叶立德形成/[2,3]-σ迁移重排/反苄基酸重排,然后有机催化的不对称Nazarov环化/炔到联烯异构化,最终得到手性联烯环戊烯酮.开发纳扎罗夫反应的底物类别是合成化学的一项重要工作。在这里,作者报告了如何烯炔二酮进行铑催化金属有机中继催化手性联烯环戊烯酮通过Nazarov环化反应,在良好的产率和对映选择性的建设。
The Nazarov cyclization is one of the most powerful tools for the stereoselective synthesis of various cyclopentenone scaffolds. Therefore, developing the new classes substrate of Nazarov reaction is an important endeavor in synthetic chemistry. Herein, we report enyne diketones, enables diastereo- and enantioselective construction of chiral allene cyclopentenones in moderate to good yields with good enantioselectivities (up to 97% ee). Importantly, it is a typical example for asymmetric synthesis of cyclopentanones with allene moiety using Nazarov cyclisation. Mechanistic studies indicate that this metal-organo relay catalysis protocol involves a rhodium-catalyzed tandem oxonium ylide formation/[2,3]-sigmatropic rearrangement/reverse benzylic acid rearrangement, followed by organo-catalyzed asymmetric Nazarov cyclization/alkyne-to-allene isomerization to give the final chiral allene cyclopentenones. Developing classes of substrates for the Nazarov reaction is an important endeavour for synthetic chemistry. Here, the authors report how enyne diketones undergo rhodium-catalyzed metal-organo relay catalysis for the enantioselective construction of chiral allene cyclopentenones via Nazarov cyclisation in good yields and enantioselectivities.
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