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首页> 外文期刊>ACS catalysis >Competing Noncovalent Interactions Control the Stereoselectivity of Chiral Phosphoric Acid Catalyzed Ring Openings of 3-Substituted Oxeta nes
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Competing Noncovalent Interactions Control the Stereoselectivity of Chiral Phosphoric Acid Catalyzed Ring Openings of 3-Substituted Oxeta nes

机译:竞争性非共价相互作用控制手性磷酸催化3-取代的氧杂环丁烷的开环的立体选择性

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摘要

The noncovalent interactions responsible for enantioselectivity in organocatalytic oxetane ring openings were quantified using density functional theory (DFT) computations. Data show that the mode of stereoinduction in these systems differs markedly for different substituted oxetanes, highlighting the challenge of developing general stereochemical models for such reactions. For oxetanes monosubstituted at the 3-position, the enantioselectivity is primarily due to differential CH center dot center dot center dot pi interactions between the mercaptobenzothiazole nucleophile and the aromatic backbone of the catalyst. This can be contrasted with 3,3-disubstituted oxetanes, for which interactions between an oxetane substituent and the phosphoric acid functionality and/or the anthryl groups of the catalyst become more important. The former effects are particularly important in the case of 3-OH-substituted oxetanes. Overall, these reactions demonstrate the diversity of competing noncovalent interactions that control the stereoselectivity of many phosphoric acid catalyzed reactions.
机译:使用密度泛函理论(DFT)计算来定量负责有机催化氧杂环丁烷开环中对映选择性的非共价相互作用。数据表明,对于不同的取代氧杂环丁烷,这些系统中的立体诱导模式显着不同,这凸显了为此类反应开发通用立体化学模型的挑战。对于在3-位单取代的氧杂环丁烷,对映选择性主要是由于巯基苯并噻唑亲核试剂与催化剂的芳族主链之间的CH中心点中心点中心点pi相互作用不同。这可以与3,3-二取代的氧杂环丁烷相反,对于3,3-二取代的氧杂环丁烷,氧杂环丁烷取代基与磷酸官能度和/或催化剂的蒽基之间的相互作用变得更加重要。在3-OH-取代的氧杂环丁烷的情况下,前一种作用尤其重要。总体而言,这些反应证明了竞争性非共价相互作用的多样性,这些相互作用控制许多磷酸催化反应的立体选择性。

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