Multicomponent Synthesis of 1-Aryl 1,2,4-Triazoles
作者:Annie Tam、Ian S. Armstrong、Thomas E. La Cruz
DOI:10.1021/ol401428x
日期:2013.7.19
A multicomponent (single reactor) process for the synthesis of 1-aryl 1,2,4-triazoles was explored and developed. This transformation prepared the 1,2,4-triazole directly from anilines, amino pyridines, and pyrimidines. The reaction scope was explored with 21 different substrates, and the position of the nitrogen atoms in the newly formed ring was established by 15N labeling and NMR spectroscopy.
A versatile and modular one-pot method for the preparation of differently substituted symmetrical and unsymmetrical imidazolium salts is reported, and 19 examples are given. In the key step, readily available formamidines and α-halo ketones are coupled to give imidazolinium salts 3, followed by imidazolium salt formation by acylation-induced elimination. For many substitution patterns of the imidazolium
Evaluation of Electrophilic Heteroaromatic Substitution: Synthesis of Heteroaromatic-Fused Pyrimidine Derivatives via Sequential Three-Component Heterocyclization
作者:Fung Fuh Wong、Yu-Ying Huang、Chun-Hsi Chang
DOI:10.1021/jo301463m
日期:2012.10.5
A new sequentialthree-componentheterocyclization was developed by reacting aromatic and heterocyclic substrates, including aminobenzenes, 1-aminonaphthalene, 2-aminopyrazines, 5-aminopyrazoles, 3-aminopyridine, 5-aminopyrimidine, 5-aminoquinoline, and 8-aminoquinoline, with formamide in the presence of PBr3. The reaction gave the corresponding pyrazolo[3,4-d]pyrimidines in good yields (59–96%), except
通过使芳香族和杂环底物(包括氨基苯,1-氨基萘,2-氨基吡嗪,5-氨基吡唑,3-氨基吡啶,5-氨基嘧啶,5-氨基喹啉和8-氨基喹啉)与甲酰胺反应,开发了一种新的顺序三组分杂环化方法在PBr 3存在下。除氨基苯和3-氨基吡啶外,该反应以较高的收率(59-96%)得到了相应的吡唑并[3,4- d ]嘧啶。提出了包括三步酰胺化,亲电取代亚胺化和氧化环化的合理反应机理,以解决杂环化问题。发现反应的反应性与芳族或杂环底物的亲电子性成比例。
Ionic liquid‐functionalized mesoporous silica nanoparticles ([pmim]FeCl
<sub>4</sub>
/MSNs): Efficient nanocatalyst for solvent‐free synthesis of
<i>N</i>
,
<i>N</i>
′‐diaryl‐substituted formamidines
作者:Zahra Nasresfahani、Mohammad Zaman Kassaee、Esmaiel Eidi
DOI:10.1002/aoc.3800
日期:2017.11
thermal analyses. The material was utilized as an efficient heterogeneouscatalyst for the synthesis of N,N′‐diaryl‐substituted formamidines through the reaction of triethyl orthoformate with arylamines undersolvent‐freeconditions. The catalyst was recovered easily and reused several times without significant loss of its catalytic activity.
Synthesis of tetrahydrobenzophenanthridinones.<b>V</b>
作者:Roberto Martínez、Rubén A. Toscano、Irma E. Linzaga、Hanani Sánchez
DOI:10.1002/jhet.5570290603
日期:1992.10
The preparation of tetrahydrobenzophenanthridinones 4 and 5, potential useful intermediates for the synthesis of Dynemicin A models, is described. The structure of all products was corroborated by ir, 1H-nmr, ms and X-ray spectroscopy.