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    烯丙醇及其衍生物与二氧化碳的羧基化反应研究进展

    Research progress on carboxylation of allylic alcohols and their derivatives with carbon dioxide

    • 摘要: 二氧化碳(CO2)来源丰富、价格低廉、环境友好且可再生,是极具吸引力的绿色C1资源。羧酸化合物广泛存在于药物分子、天然产物及功能材料中,作为关键合成砌块和中间体,在医药、农药和化工等领域发挥着不可替代的作用。因此,通过催化活化实现C—O与C—C键的精准构建,将CO2高效转化为高附加值羧酸类化合物,不仅具有重要的科学研究价值,也高度契合国家碳达峰、碳中和目标及可持续发展战略需求。烯丙醇及其衍生物(如烯丙基卤化物、烯丙基酯等)是一类易于获取且结构多样的合成子。基于此,聚焦于4类重要的烯丙基类底物——烯丙醇、烯丙基卤化物、烯丙基酯以及烯丙基C—H化合物,系统综述它们在不同催化体系下与CO2的羧基化反应研究进展。研究表明,已发展体系大多以过渡金属配合物作为催化剂,烯丙醇及其衍生物在与过渡金属发生氧化加成时,可形成离域的π−烯丙基金属中间体,通常表现出亲电性;而在还原条件下,该中间体可发生极性翻转,转变为亲核试剂,进而与多种亲电试剂发生反应包括稳定的CO2。因此,催化体系主要按照金属类型、无金属催化体系来分类阐述,系统总结了热催化、光催化、电催化、金属催化及光/电/金属协同催化等活化模式,并对不同催化体系下的反应机制、底物适用性和区域选择性控制进行了深入讨论,旨在为发展更加绿色、高效和可持续的CO2转化策略提供参考。

       

      Abstract: Carbon dioxide (CO2) is an attractive green C1 resource due to its abundance, low cost, environmental friendliness, and renewability. These carboxylic acids are widely found in pharmaceutical molecules, natural products, and functional materials, serving as essential synthetic building blocks and intermediates with irreplaceable roles in pharmaceuticals, pesticides and chemicals. Therefore, the efficient transformation of CO2 into high-value carboxylic acids by catalytic activation to construct C—O and C—C bonds precisely, not only has significant scientific research value, but also fits national goals of carbon peaking and carbon neutrality as well as the demands of the sustainable development strategy. Allylic alcohols and their derivatives (e.g., ally halides, allyl ester, etc.) are a class of easily accessible and structurally diverse synthons. Based on this, the article focuses on four kinds of allyl compounds including allyl alcohols, allyl halides, allyl esters, and allyl C—H compounds, and systematically reviews the research progress of their carboxylation reactions with CO2 under different catalytic systems. The research indicates that transition metal complexes are the main catalysts in the developed system. Allyl alcohols and its derivatives undergo oxidative addition with transition metals to form delocalized π-allyl metal intermediates, which typically exhibit electrophilic character. Under reductive conditions, these intermediates can be transformed into nucleophiles that react with various electrophiles, including stable CO2. So catalytic systems are mainly classified and expounded according to metal types and metal-free catalytic systems. We systematically summarize diverse activation modes—including thermal catalysis, photocatalysis, electrocatalysis, metal catalysis, and photo/electro/metal synergistic catalysis. The reaction mechanisms, substrate scope and regioselectivity control under different catalytic systems were deeply discussed, aiming to develop greener, more efficient and sustainable CO2 conversion strategies.

       

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