Pentaatomic heteroaromatic cations. 18. Acylation of pyrrole and N-methylpyrrole with 1,3-benzoxathiolium tetrafluoroborates. A high-yield method for the synthesis of diacylpyrroles
A Mild and Facile One-Pot Synthesis of N-Methyl-3-Acyl-Pyrroles
作者:Hassan Valizadeh、Ashraf Fakhari
DOI:10.3390/molecules15052972
日期:——
N-Methyl-3-acylpyrroles were synthesized via a multicomponent reaction of dimethylacetylene dicarboxylate (DMAD), N-methylhydroxylamine and acylchlorides in the presence of KHCO3. For comparison both conventional and microwave protocols were examined in this procedure. The reaction is clean and gives the products in good to excellent yields under conventional heating conditions at 40 ºC in anhydrous dichloromethane.
Regioselective Synthesis of Acylated <i>N</i>-Heterocycles via the Cascade Reactions of Saturated Cyclic Amines with 2-Oxo-2-arylacetic Acids
作者:Xiaonan Shi、Xi Chen、Muhua Wang、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.joc.8b00805
日期:2018.6.15
in this cascade process, the copper catalyst is believed to play a crucial role not only in dehydrogenation but also in the decarboxylation and cross coupling reaction. To the best of our knowledge, this is the first example in which different classes of acylated N-heterocycles were directly prepared from the readily available saturated cyclic amines by using 2-oxo-2-arylacetic acids as the noncorrosive
Insights into the Friedel–Crafts Benzoylation of <i>N</i>-Methylpyrrole inside the Confined Space of the Self-Assembled Resorcinarene Capsule
作者:Veronica Iuliano、Carmen Talotta、Margherita De Rosa、Annunziata Soriente、Placido Neri、Antonio Rescifina、Giuseppe Floresta、Carmine Gaeta
DOI:10.1021/acs.orglett.3c01935
日期:2023.9.8
Friedel–Crafts benzoylation of N-methylpyrrole 2 can run inside the confined space of the hexameric resorcinarene capsule C. The bridged water molecules at the corner of C act as H-bonding donor groups to polarize the C–Cl bond of benzoyl chlorides 3a–f. Confinement effects on the regiochemistry of the FC benzoylation of N-methylpyrrole are observed. The nature of the para-substituents of 3a–f and
N-甲基吡咯2的弗里德尔-克来福特苯甲酰化可以在六聚间苯二酚胶囊C的有限空间内进行。C角处的桥联水分子充当氢键供体基团,使苯甲酰氯3a – f的 C-Cl 键极化。观察到N-甲基吡咯 FC 苯甲酰化区域化学的限制效应。3a – f的对位取代基的性质及其与C的水分子建立氢键的能力与胶囊施加的空间收缩协同作用,驱动产物4a – f的区域化学。量子力学研究表明,在C的空腔内, 2的 FC 苯甲酰化具有双分子协同 S N 2 机制,相应地,平面上亲核乙烯基取代 (S N Vπ) — 由水分子和水分子之间的氢键相互作用支持。留下Cl原子和羰基。
Catalytic Friedel–Crafts acylation: magnetic nanopowder CuFe2O4 as an efficient and magnetically separable catalyst
Catalytic regioselective Friedel-Crafts acylation of an array of anisoles/arenes with various acid chlorides using 5-20 mol % of magnetic nanopowder CuFe2O4 is reported. Unlike the conventional Friedel-Crafts reactions, which are catalyzed by moisture sensitive homogeneous catalysts/promoters, the nanopowder CuFe2O4 catalyst is moisture insensitive and the product/ketone-catalyst isolation is easily achieved using the magnetic properties of CuFe2O4. (C) 2013 Elsevier Ltd. All rights reserved.