常见三氟甲基源释放三氟甲基自由基能力的理论计算研究

doi:10.6023/A18080334

化学学报 ›› 2018, Vol. 76 ›› Issue (12): 988-996.DOI: 10.6023/A18080334 上一篇下一篇

所属专题：有机氟化学；纪念南开大学化学学科创建100周年

研究论文

常见三氟甲基源释放三氟甲基自由基能力的理论计算研究

李曼^a, 康会英^a, 薛小松^a, 程津培^a,b

a. 南开大学元素有机国家重点实验室化学学院天津化学化工协同创新中心天津 300071;
b. 清华大学化学系基础分子科学中心北京 100084

投稿日期:2018-08-14 发布日期:2018-10-08
通讯作者: 薛小松,E-mail:xuexs@nankai.edu.cn E-mail:xuexs@nankai.edu.cn
基金资助:
项目受国家自然科学基金（Nos.21772098，21390400）、天津化学化工协同创新中心、南开大学元素有机国家重点实验室以及中央高校基本科研业务费专项资金资助.

Computational Study of the Trifluoromethyl Radical Donor Abilities of CF₃ Sources

Li Man^a, Kang Huiying^a, Xue Xiao-Song^a, Cheng Jin-Pei^a,b

a. State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Tianjin 300071, China;
b. Center of Basic Molecular Science, Department of Chemistry, Tsinghua University, Beijing 100084, China

Received:2018-08-14 Published:2018-10-08
Contact: 10.6023/A18080334 E-mail:xuexs@nankai.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 21772098, 21390400), Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), the State Key Laboratory on Elemento-Organic Chemistry, and the Fundamental Research Funds for the Central Universities.

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1. 常见三氟甲基源释放三氟甲基自由基能力的理论计算研究.PDF(931KB)

摘要/Abstract

三氟甲基自由基源（·CF₃）是发展自由基三氟甲基化反应的基础.采用密度泛函理论（M06-2X），系统研究35个常见三氟甲基源释放CF₃自由基的能力（TR^·DA：trifluoromethyl radical donor ability）及可能的途径.计算结果表明，35个三氟甲基源通过化学键均裂释放三氟甲基自由基所需能量跨度为-21.5至95.2 kcal·mol^-1.单电子转移、卤键和硫键给体（halogen/chalcogen-bond donor）可促进CF₃自由基释放.相关研究结果将有助于理解和设计新自由基三氟甲基化试剂和反应.

关键词: 自由基三氟甲基化试剂, 键均裂解离焓, 结构-活性关系, 卤键, 密度泛函计算

Organic compounds containing trifluoromethyl (CF₃) group(s) are widely prevalent in biochemical and medicinal science. This is mainly due to the fact that the trifluoromethyl group often improves the metabolic stability and lipophilicity of biologically active compounds. The need of efficient methods for the incorporation of this group into target molecules has spurred research to discover new, practical CF₃ sources. Among various CF₃ sources, the radical trifluoromethylating reagents has provided a strong driving force for the discovery of the novel trifluoromethylation reactions, and contributed enormously to the efficient synthesis of various CF₃-containing compounds. Although a wide variety of radical CF₃ sources are now available to organic chemists, little attention has been paid to assess their trifluoromethyl radical donor abilities (TR^·DA). Moreover, the available radical reagents show a very rich and diverse reactivity. The establishment of an extensive scale to quantify their CF₃ radical donating abilities should be of great value for both the rational design of novel reagents and the judicious selection of appropriate reagent to explore new radical reactions. Herein, we present a systematic computational study of the homolytic X―CF₃ bond dissociation enthalpies of 35 radical trifluoromethylating reagents by using the SMD-M06-2X/[6-311++G(2df, 2p)-Def2-QZVPPD]//SMD-M06-2X/[6-31+G(d)-LANL2DZ] method, aiming to provide an energetic guide for estimating their trifluoromethyl radical donor abilities. A comprehensive TR^·DA scale was constructed, which covers a range from -21.5 to 95.2 kcal·mol^-1. The effects of the frequently used activators including single electron transfer reagents and halogen/chalcogen-bond donors on trifluoromethyl radical donor abilities were investigated. The results show that single electron transfer is the most efficient way to promote the CF₃ radical release. We expect that the results of this study could be highly valuable for the mechanistic understanding and the rational design of novel CF₃ sources and new radical trifluoromethylation reactions.

Key words: radical trifluoromethylating reagent, homolytic bond dissociation enthalpy, structure-reactivity relationship, halogen bond, DFT calculation

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李曼, 康会英, 薛小松, 程津培. 常见三氟甲基源释放三氟甲基自由基能力的理论计算研究[J]. 化学学报, 2018, 76(12): 988-996.

Li Man, Kang Huiying, Xue Xiao-Song, Cheng Jin-Pei. Computational Study of the Trifluoromethyl Radical Donor Abilities of CF₃ Sources[J]. Acta Chim. Sinica, 2018, 76(12): 988-996.

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常见三氟甲基源释放三氟甲基自由基能力的理论计算研究

Computational Study of the Trifluoromethyl Radical Donor Abilities of CF₃ Sources

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常见三氟甲基源释放三氟甲基自由基能力的理论计算研究

Computational Study of the Trifluoromethyl Radical Donor Abilities of CF3 Sources

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Computational Study of the Trifluoromethyl Radical Donor Abilities of CF₃ Sources