Urea postmodified in a metal–organic framework as a catalytically active hydrogen-bond-donating heterogeneous catalyst
作者:Xiao-Wu Dong、Tao Liu、Yong-Zhou Hu、Xin-Yuan Liu、Chi-Ming Che
DOI:10.1039/c3cc42531b
日期:——
New functionally diverse urea-derived MOF hydrogen-bond-donating heterogeneous catalysts were achieved via postsynthetic modification, which exhibit excellent catalytic activity and very broad substrate scopes for the FriedelâCrafts alkylation reactions.
De Novo Tailoring Pore Morphologies and Sizes for Different Substrates in a Urea-Containing MOFs Catalytic Platform
作者:Zhanfeng Ju、Shichen Yan、Daqiang Yuan
DOI:10.1021/acs.chemmater.5b03999
日期:2016.4.12
structure–catalytic property relationship, a platform of urea-containing MOFs with diverse topologies as hydrogen-bonding (H-bond) catalyst has been well established in the present work. During the construction of MOFs, we proposed a new strategy called the isoreticular functionalization approach in which the desired topological net is first considered as a blueprint, and then two predesigned functionalized
H-Bonding Organocatalysed Friedel-Crafts Alkylation of Aromatic and Heteroaromatic Systems with Nitroolefins
作者:Raquel P. Herrera、Alfredo Ricci、Gabriella Dessole
DOI:10.1055/s-2004-832844
日期:——
Catalytic amounts (10 mol%) of bis-arylureas and -thioureas promote the Friedel-Crafts alkylation with nitroolefins of aromatic and heteroaromatic N-containing derivatives. A sizeable improvement of the yields is noticed on running the reactions in the absence of solvent. When applied to indoles this protocol provides in good to excellent yields and with high selectivity the corresponding Michael adducts
Friedel-Crafts Alkylation of Indoles with Nitroalkenes through Hydrogen-Bond-Donating Metal-Organic Framework
作者:Purna Chandra Rao、Sukhendu Mandal
DOI:10.1002/cctc.201601583
日期:2017.4.7
Usually, urea derivatives undergo self‐recognition and aggregation during homogeneous catalytic processes. To avoid this, a new approach involving the incorporation of urea moieties into metal–organicframeworks (MOFs) was recently developed. Herein, we synthesized a new porous, zinc‐based MOF by using ureylenic acid that acts as a hydrogen‐bond‐donating catalyst. According to our knowledge, the pores
generate indolyl nitroalkane 5 and pyrrolyl nitroalkane 7 in high yields using β-nitrostyrene and indole/pyrrole at room temperature in the presence of catalytic amount of iodine is reported. The short reaction times and high yields of product are noteworthy. Molecular iodine promoted Michaeladdition is operationally simple and efficient method compared to the known Lewis acids or rare earth metal