Kinetic Analysis of a Cysteine-Derived Thiyl-Catalyzed Asymmetric Vinylcyclopropane Cycloaddition Reflects Numerous Attractive Noncovalent Interactions.

Kinetic Analysis of a Cysteine-Derived Thiyl-Catalyzed Asymmetric Vinylcyclopropane Cycloaddition Reflects Numerous Attractive Noncovalent Interactions.
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DOI:
10.1021/jacs.1c07323
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发表时间:
2021-10-06
影响因子:
15
通讯作者:
Miller SJ
Miller SJ
中科院分区:
化学1区
文献类型:
--
作者:
Turek AK;Sak MH;Miller SJ

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本文研究了肽基硫自由基催化乙烯基环丙烷(VCP)环加成反应的动力学。使用反应进程动力学分析来分析反应,揭示VCP的开环是速率和对映体决定的。这些结论得到了涉及外消旋和对映体纯VCP起始物料的研究的进一步证实。非共价相互作用在整个过程中起着关键作用:肽催化剂和VCP都表现出非生产性的自聚集,这似乎被催化剂和VCP之间的结合所破坏。这反过来解释了对关键催化剂特征的要求,即脯氨酸残基4位的取代基,这是周转率/速率和选择性所需的。
Kinetic studies of a vinyl cyclopropane (VCP) cycloaddition, catalyzed by peptide-based thiyl radicals, are described. Reactions were analyzed using reaction progress kinetic analysis, revealing that ring-opening of the VCP is both rate- and enantio-determining. These conclusions are further corroborated by studies involving racemic and enantiopure VCP starting material. Noncovalent interactions play key roles throughout: both the peptide catalyst and VCP exhibit unproductive self-aggregation, which appears to be disrupted by binding between the catalyst and VCP. This in turn explains the requirement for the key catalyst feature, a substituent at the 4-position of the proline residue, which is required for both turnover/rate and selectivity.
在阴离子结合催化中的催化剂和周期催化剂的合作。
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