On the basis of a synergistic strategy for CO₂ activiation and conversion, a water-promoted selective synthesis of 5-aryl-2-oxazolidinones from aziridines and CO₂ has been exploited in a metal- and base-free system in confined nanospaces of hierarchical porous silica, affording moderate to good conversions and yields. In this process, carbonic acid in-situ generated interacts with and ingeniously activates the aziridine ring, facilitating its subsequent transformation and promoting the selectivity of 5-substituted products. DFT calculations, FTIR spectroscopy and pH value monitoring reveal that the excellent 5-postion regio-selectivity is dictated by kinetics, which is attributed to the formation of a latent benzyl carbocation in the transition state. The confined nanospaces of hierarchical porous silica can be considered as plenty of nanoreactors, which would change concentrations of reagents and activation parameters, stabilize transition states and enhance the kinetics process. This environment-friendly system provides a synergistic strategy of optimizing both the chemical function and physical microenvironment to enhance CO₂ activation, and enriches the carbon capture and utilization (CCU) coupling process by conversion of the waste (water-fixed CO₂) into value-added compounds.

在CO ₂活化和转化的协同策略的基础上，水从氮丙啶和CO ₂选择性合成5-芳基-2-恶唑烷酮已在分层多孔二氧化硅的受限纳米空间中的无金属和无碱体系中进行了开发，可提供中等至良好的转化率和产率。在此过程中，原位生成的碳酸与氮丙啶环相互作用并巧妙地激活了氮丙啶环，从而促进了其随后的转化并提高了5-取代产物的选择性。DFT计算，FTIR光谱和pH值监测表明，优异的5位区域选择性由动力学决定，这归因于过渡态中潜在的苄基碳正离子的形成。可以将分层多孔二氧化硅的受限纳米空间视为大量的纳米反应器，这将改变试剂的浓度和活化参数，稳定过渡态并增强动力学过程。₂活化，并通过将废物（固定的CO ₂）转化为增值化合物来丰富碳捕获和利用（CCU）耦合过程。