Diastereoselective Synthesis of α-Aryl-Substituted LnDOTA Chelates from Achiral Starting Materials by Deracemization Under Mild Conditions.

Diastereoselective Synthesis of α-Aryl-Substituted LnDOTA Chelates from Achiral Starting Materials by Deracemization Under Mild Conditions.
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在温和条件下通过去消旋化从非手性起始材料非对映选择性合成 α-芳基取代的 LnDOTA 螯合物。

DOI:
10.1002/chem.202301887
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发表时间:
2023
期刊:
Chemistry (Weinheim an der Bergstrasse, Germany)
影响因子:
--
通讯作者:
Woods,Mark
Woods,Mark
中科院分区:
--
文献类型:
--
作者:
Maier,KarleyB;Rust,LaurenN;Kupara,CharleneI;Woods,Mark

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DOTA框架的取代衍生物通常被用于改变螯合物性质并促进螯合物与其他分子结构的缀合。然而,可以引入α-位的取代基的范围传统上受到促进立体选择性合成的合适的对映体纯起始材料的可用性的限制。已经制备了在α-位具有苯基和苯甲酸酯取代基的四取代的DOTA衍生物。最初的合成使用对映体纯的原料,但没有得到对映体纯的产物。这表明在合成过程中立体中心的完整性没有得到保持,尽管同手性非对映异构体是主要的反应产物。当从外消旋或甚至非手性物质开始时,纯手性非对映异构体可以作为主要或唯一的反应产物产生。去外消旋被发现发生在螯合过程中通过形成稳定的芳基取代基的烯醇化物。芳基能够去外消旋化的这种一般能力极大地增加了可以以非对映化学选择性引入DOTA型配体中的取代基的范围。
Substituted derivatives of the DOTA framework are of general interest to alter chelate properties and facilitate the conjugation of chelates to other molecular structures. However, the scope of substituents that can be introduced into the α‐position has traditionally been limited by the availability of a suitable enantiopure starting materials to facilitate a stereoselective synthesis. Tetra‐substituted DOTA derivatives with phenyl and benzoate substituents in the α‐position have been prepared. Initial syntheses used enantiopure starting materials but did not afford enantiopure products. This indicates that the integrity of the stereocenters was not preserved during synthesis, despite the homo‐chiral diastereoisomer being the major reaction product. The homochiral diastereoisomer could be produced as the major or sole reaction product when starting from racemic or even achiral materials. Deracemization was found to occur during chelation through the formation of an enolate stabilized by the aryl substituent. This general ability of aryl groups to enable deracemization greatly increases the range of substituents that can be introduced into DOTA‐type ligands with diastereochemical selectivity.
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