Aromatic N-Arylations Catalyzed by Copper-Anchored Porous Zinc-Based Metal-Organic Framework under Heterogeneous Conditions
作者:Tanmoy Maity、Debraj Saha、Subratanath Koner
DOI:10.1002/cctc.201400056
日期:2014.8
A highly porous Zn‐based metal–organicframework (MOF) IRMOF‐3 was covalently decorated with pyridine‐2‐aldehyde. The free amine group of IRMOF‐3 upon condensation with pyridine‐2‐aldehyde affords a bidentate Schiff‐base moiety in the porous matrix. The Schiff base moieties are availed to anchor copper(II) ions to display the catalyst’s utility towards catalytic reactions. The catalyst was characterized
高度多孔的锌基金属-有机骨架(MOF)IRMOF-3与吡啶-2-醛共价修饰。与吡啶-2-醛缩合后,IRMOF-3的游离胺基在多孔基质中提供双齿席夫碱部分。席夫碱部分可用于锚定铜(II)离子,以显示催化剂对催化反应的效用。通过紫外/可见光和红外光谱,粉末XRD光谱,SEM能量色散X射线光谱和氮吸附测量对催化剂进行了表征。在Cs 2 CO 3存在下,在温和条件下(90°C),该催化剂在DMSO介质中催化含氮杂环与芳基溴的N-芳基化反应具有出色的催化活性。。由于MOF的孔内存在活性位点,因此多孔催化剂表现出对底物的尺寸选择性。在多达五个连续的催化循环中,锚固的配合物似乎在催化反应过程中不会被浸出或分解,这显示出优于均相催化的实际优势。
Regioselective Synthesis, NMR, and Crystallographic Analysis of N1-Substituted Pyrazoles
A systematic study of the N-substitution reactions of 3-substituted pyrazoles under basic conditions has been undertaken. Regioselective N1-alkylation, -arylation, and -heteroarylation of 3-substituted pyrazoles have been achieved using K2CO3-DMSO. The regioselectivity is justified by the DFT calculations at the B3LYP/6-31G**(d) level. A consistent steric effect on chemical shift has been observed
对3-取代的吡唑在碱性条件下的N-取代反应进行了系统的研究。使用K 2 CO 3 -DMSO已经实现了3-取代的吡唑的区域选择性N1-烷基化,-芳基化和-杂芳基化。通过在B3LYP / 6-31G **(d)水平上的DFT计算可以证明区域选择性。对于N-烷基吡唑类似物,已经观察到对化学位移的一致的空间效应。已获得二十五个X射线晶体学结构,以确认主要产品的区域化学。
Knorr, Justus Liebigs Annalen der Chemie, 1894, vol. 279, p. 228 Anm.50