[2.2.2]双环环炔前体制备及反应活性研究
首发时间:2020-02-17
摘要:本论文以苯炔前体为原料,经过多步反应构建了[2.2.2]双环立体构型的环炔前体。以2-甲基对苯醌为原料,经过2步反应合成含羟基的苯炔前体,再通过氧化去芳构化制备环己联三烯前体,进而与N-苯基马来酰亚胺发生[4+2]反应,得到[2.2.2]双环立体构型的环炔前体。该环炔前体可以在氟离子作用下与呋喃发生反应,得到[4+2]环加成产物,证明在反应过程中生成了[2.2.2]双环环炔中间体。该环炔前体的制备及其反应活性的开发可为多取代[2.2.2]双环骨架的构建提供新的合成思路,拓展环炔中间体在合成中的应用范围。
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Preparation and Reactivity Study of [2.2.2] Bicyclic Cyclohexyne Precursors
Abstract:In this paper, a [2.2.2] bicyclic stereoalkyne precursor was synthesized in multiple steps using phenylyne as the raw material. Using 2-methylcyclohexa-2,5-diene-1,4-dione as a raw material, a phenylyne precursor containing a hydroxyl group was synthesized through a two-step reaction, and then a cyclohexyltriene precursor was generated via oxidative dearomatization operation, that it obtained a [2.2.2] bicyclic stereoalkyne precursor by [4 + 2] reaction with N-Phenylmaleimide. Finally, the[2.2.2] bicyclic stereoalkyne precursor were activated with fluoride ions and reacted with furan, to obtain [ 4 + 2] cycloaddition product. It was proved that [2.2.2] bicyclic stereoalkyne precursor intermediate were formed during the reaction. This method can provide new synthetic ideas for the construction of [2.2.2] bicyclic skeletons, and expand the application of cycloalkyne intermediates in synthesis.
Keywords: Cycloalkyne cycloalkyne precursor cyclohexadiene dearomatization
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