Recyclable Covalent Triazine Framework-Supported Iridium Catalyst For The Synthesis Of N-Methylamine And Quinoline Derivatives

As green chemistry and atomic economy have received more and more attention,transition metal catalyzed hydrogen auto-transfer processes and acceptorless dehydrogenation reactions ushered in a development boom.However,most of them are homogeneous catalysis,and the catalyst cannot be recycled,which not only increases the cost,but also is not conducive to the industrialization process of these two reactions.Therefore,researchers are increasingly focusing on the development of heterogeneous recyclable catalysts.This thesis aims to achieve efficient and recyclable heterogeneous catalysis under the premise of more environmentally friendly and milder conditions.Two covalent triazine framework-supported iridium catalysts have been prepared and characterized and applied to the following two synthesis methods.The heterogeneous catalyst Cp*Ir@CTF has been used to efficiently catalyze the N-methylation reaction between amine and methanol under the action of the weak base Cs₂CO₃,and the yield is still as high as 90%in the sixth cycle.This work fully demonstrated the potential of covalent triazine framework-supported transition metal catalysts in the process of catalyzing the automatic transfer of hydrogen.The heterogeneous catalyst（Tpy）Ir@CTF and KOH have been used to efficiently catalyze the reaction of 2-aminobenzyl alcohol and ketone to synthesize quinoline derivatives.After six cycles,the activity of the catalyst did not decrease significantly.This work fully demonstrated the potential of covalent triazine framework-supported transition metal catalysts in catalyzing acceptorless dehydrogenation reactions.Both of the above two heterogeneous catalysts can be separated from the reaction system by simple filtration,and both maintain good catalytic activity and stability.The two researches in this thesis extend homogeneous catalysis to heterogeneous catalysis,which provide the possibility for the industrialization of hydrogen auto-transfer processes and acceptorless dehydrogenation reactions.