Pyrrole pincers containing imidazole, pyrazole and 1,2,4-triazole groups
摘要:
Pincer compounds containing a central pyrrole linked through methylene groups in the 2,5-positions to two N-imidazole, N-pyrazole and N-1,2,4-triazole heterocyles have been prepared via a common quaternary amine precursor. Alkylation of the imidazole groups using methyl iodide or benzyl bromide gave imidazolium compounds. The methylated iodide salt was characterised crystallographically, showing significant pyrrole I center dot center dot center dot HN, imidazolium I center dot center dot center dot HC and imidazolium I center dot center dot center dot(sp(2)-C) interactions leading to a U-shaped conformation of the cationic pincer compound. The alkylated cations which were investigated as precursors to pyrrole-carbene pincer ligands, but all attempts to either coordinate palladium or deprotonate using silver oxide led to cleavage of the heterocycles from the central pyrrole. The result was the formation of palladium and silver complexes containing 3-N-methylimidazole (3-N-MeIm) or 3-N-benzylimidazole (3-N-BzIm) ligands: (3-N-MeIm)PdI2, (3-N-MeIm)PdCl2 and [(3-N-MeIm)(2)Ag]I, with the (3-N-MeIm)PdI2 complex characterised by crystallography. Pyrazole, 3,5-dimethylpyrazole and 1,2,4-triazole pincer compounds were prepared, the latter characterised by a molecular structure determination. The pyrazole and 1,2,4-triazole pincers coordinate directly to palladium through the deprotonated central pyrrolyl and neutral N-donors on the flanking heterocycles. (C) 2014 Elsevier B. V. All rights reserved.
Synthesis of novel NHC-pyrrole-NHC C-N-C Pincer proligands
作者:Hong Jiang、Hong Ding、Kaiqi Ge、Pei Guang、Yunfei Li、Xiang Liu、Guangsheng Pang、Yanhui Shi
DOI:10.1515/hc-2012-0108
日期:2012.10.1
Abstract
Two novel pyrrole-functionalized bis(benzoimidazolium) salts, which are novel NHC-pyrrole-NHC C-N-C Pincer proligands were synthesized in high yield. Both of these compounds are fully characterized by 1H and 13C NMR, IR and elemental analysis.
Metal complexes of N-heterocyclic carbenes as radiopharmaceuticals and antibiotics
申请人:Youngs Wiley
公开号:US20070021401A1
公开(公告)日:2007-01-25
A method for inhibiting microbial growth comprises administering an effective amount of a silver complex of a N-heterocyclic amine. A method for treating cancer cells or a method for imaging one or more tissues of a patient includes administering an effective amount of a complex of a N-heterocyclic amine and a radioactive metal. A method for treating urinary tract infections utilizing silver complexes of N-heterocyclic carbenes. N-heterocyclic carbenes of the present invention may be represented by the formula
wherein Z is a heterocyclic group, and R
1
and R
2
are, independently or in combination, hydrogen or a C
1
-C
12
organic group selected from the group consisting of alkyl, cycloalkyl, alkenyl, cycloalkenyl, alkynyl, aryl, arylalkyl, alkylaryl, heterocyclic, and alkoxy groups and substituted derivatives thereof.
Metal Complexes of N-Heterocyclic Carbenes as Radiopharmaceuticals and Antibiotics
申请人:Youngs Wiley J.
公开号:US20080267867A1
公开(公告)日:2008-10-30
A method for inhibiting microbial growth comprises administering an effective amount of a silver complex of a N-heterocyclic amine. A method for treating cancer cells or a method for imaging one or more tissues of a patient includes administering an effective amount of a complex of a N-heterocyclic amine and a radioactive metal. N-heterocyclic carbenes of the present invention may be represented by formula (I) wherein Z is a heterocyclic group, and R
1
and R
2
are, independently or in combination, hydrogen or a C
1
-C
12
organic group selected from the group consisting of alkyl, cycloalkyl, alkenyl, cycloalkenyl, alkynyl, aryl, arylalkyl, alkylaryl, heterocyclic, and alkoxy groups and substituted derivatives thereof.
[EN] METAL COMPLEXES OF N-HETEROCYCLIC CARBENES AS RADIOPHARMACEUTICALS AND ANTIBIOTICS<br/>[FR] COMPLEXES METALLIQUES DE CARBENES N-HETEROCYCLIQUES UTILES COMME PRODUITS RADIOPHARMACEUTIQUES ET ANTIBIOTIQUES