Preparation of 1H-2,3,4,5-Tetraarylpyrroles by oxidation of heterocyclic imine-enamines
摘要:
Heterocyclic imine-enamines 1 were prepared from metalated methyl substituted heterocycles and aromatic nitriles and then oxidized with lead tetracetate to give various tetraarylpyrroles 2.
ZnCl2-catalyzed three-component coupling reaction involving a variety of functionalized enamines, triethyl orthoformate, and ammonium acetate, which leads to the production of 4,5-disubstituted pyrimidinederivatives in a single step. The procedure can be successfully applied to the efficient synthesis of mono- and disubstituted pyrimidinederivatives, using methyl ketone derivatives instead of enamines
A General Strategy for N-(Hetero)arylpiperidine Synthesis Using Zincke Imine Intermediates
作者:Jake D. Selingo、Jacob W. Greenwood、Mary Katherine Andrews、Chirag Patel、Andrew J. Neel、Barbara Pio、Michael Shevlin、Eric M. Phillips、Matthew L. Maddess、Andrew McNally
DOI:10.1021/jacs.3c11504
日期:2024.1.10
compounds. Here, we present a general strategy to access N-(hetero)arylpiperidines using a pyridine ring-opening and ring-closing approach via Zincke imine intermediates. This process generates pyridiniumsaltsfrom a wide variety of substituted pyridines and (heteroaryl)anilines; hydrogenationreactions and nucleophilic additions then access the N-(hetero)arylpiperidine derivatives. We successfully applied
Condensation of β‐(2‐pyridyl)enamine and α,β‐unsaturated ketone in the presence of FeCl3 under air afforded highly substituted pyridines. Synthesis of differently substituted pentaarylpyridines was consequently achieved via only three steps from commercially available reagents with simple experimental manipulations.
Preparation of 1H-2,3,4,5-Tetraarylpyrroles by oxidation of heterocyclic imine-enamines
作者:J. Lehuede、Y. Mettey、J-M. Vierfond
DOI:10.1080/00397919608086755
日期:1996.2
Heterocyclic imine-enamines 1 were prepared from metalated methyl substituted heterocycles and aromatic nitriles and then oxidized with lead tetracetate to give various tetraarylpyrroles 2.