acids having an α electron-withdrawing substituent in the presence of TFAA and a Lewis acid catalyst resulted in the formation of fused cyclopentenones via a tandemacylation–Nazarovcyclization sequence, while either the acylation product obtained or no reaction occurred in the absence of the Lewis acid catalyst.
Template-Induced Diverse Metal-Organic Materials as Catalysts for the Tandem Acylation-Nazarov Cyclization
作者:Chao Huang、Ran Ding、Chuanjun Song、Jingjing Lu、Lu Liu、Xiao Han、Jie Wu、Hongwei Hou、Yaoting Fan
DOI:10.1002/chem.201403162
日期:2014.12.1
continuing quest to develop a metal–organic framework (MOF)‐catalyzed tandem pyrrole acylation–Nazarov cyclization reaction with α,β‐unsaturated carboxylic acids for the synthesis of cyclopentenone[b]pyrroles, which are key intermediates in the synthesis of natural product (±)‐roseophilin, a series of template‐inducedZn‐based (1–3) metal‐organicframeworks (MOFs) have been solvothermally synthesized
在我们继续寻求开发由金属-有机框架(MOF)催化的串联吡咯酰化-Nazarov环化反应与α,β-不饱和羧酸的合成中,用于合成环戊烯酮[ b ]吡咯,这是天然合成的关键中间体产品(±)-roseophilin,已通过溶剂热合成和表征了一系列模板诱导的基于Zn的(1-3)金属有机骨架(MOF)。从无孔MOF 1到多孔MOF 2的结构转换,再回到无孔MOF 3已经观察到由不同浓度的模板客体产生的产物。模板客体与配体之间的阴离子-π相互作用可能会影响配体的构型,并进一步调整1-3的构架。此外,MOF 1-3已证明是串联酰化-Nazarov环化反应的有效多相催化剂。特别是2的独特结构特征,包括易于接近的催化位点和合适的通道尺寸和形状,赋予了2具有MOF催化的串联酰化反应-Nazarov环化反应的所有所需功能,包括非均相催化剂,高催化活性,稳健性和出色的选择性。提出了一种可能的催化反应机理,并进一步阐
The First Examples of Nazarov Cyclizations Leading to Annulated Pyrroles
作者:Chuanjun Song、David W. Knight、Maria A. Whatton
DOI:10.1021/ol052683z
日期:2006.1.1
Reactions between alpha-substituted unsaturated carboxylic acids 20 and N-tosylpyrroles [14, 23] in the presence of trifluoroacetic anhydride result in smooth alpha-acylation of the pyrrole, followed by Nazarov cyclization to give 50-80% yields of cyclopenta[b]pyrroles. The presence of an alpha-substituent in the unsaturated acid appears to be mandatory.
Solvent-Induced Assembly of Sliver Coordination Polymers (CPs) as Cooperative Catalysts for Synthesizing of Cyclopentenone[b]pyrroles Frameworks
作者:Chao Huang、Xiao Han、ZhiChao Shao、Kuan Gao、Mengjia Liu、Yanjie Wang、Jie Wu、Hongwei Hou、Liwei Mi
DOI:10.1021/acs.inorgchem.6b03091
日期:2017.5
catalysis for tandemacylation–Nazarovcyclization reaction has been evidenced by the significantly transformed connection modes of Ag–Ag interactions in 1–3. As a result, the unique structural characteristics of 2, especially containing the Ag–Ag–Ag bonds, endow 2 with intact multinuclear reaction pathways and well-defined multinuclear platforms that can execute tandemacylation–Nazarovcyclization reaction