Mercury(II) and gold(III) derivatives of 2-phenyl pyridines and 2-phenyl-4-(methylcarboxylato)quinoline
摘要:
ortho-Mercurated derivatives of several substituted 2-phenylpyridines and of 2-phenyl-4-(methylcarboxylato)quinoline have been prepared and characterised. C,N-chelated gold(III) derivatives, [AuCl2(C6H4C5H3RN)] (R = H, 3-Me, 3,5-Me-2, 4-Pr-n, 4-Bu-t) are prepared more efficiently by trans-metallation reactions than by direct reaction of AuCl4- with the phenylpyridines. The new gold complexes were characterised spectroscopically and a variety of substitution reactions have been effected. As is usual with unsymmetrical bidentate ligands, the softer donor atom is found trans to the N-donor of the pyridine unit. Crystal-structure determinations are reported for [Au(OAc)(pmpy)(py)]ClO4, [Au(ppy)(dpbt)]BPh4, [Au(ppy)(S2CNMe2)]BPh4 and AuCl(pqcm)(2) [Hppy = 2-phenylpyridine, Hpmpy = 2-phenyl-3-methylpyridine, Hpqcm = 2-phenyl-4-(methylcarboxylato)quinoline]. (C) 2000 Elsevier Science S.A. All rights reserved.
Provided are a compound having a metal M and a first ligand L
A
comprising the structure of
where the compound is capable of functioning as a phosphorescent emitter in an organic light emitting device at room temperature.
Synthesis of 2-Substituted Pyridines via a Regiospecific Alkylation, Alkynylation, and Arylation of Pyridine <i>N</i>-Oxides
作者:Hans Andersson、Fredrik Almqvist、Roger Olsson
DOI:10.1021/ol070184n
日期:2007.3.1
Grignard reagents to pyridine N-oxides in THF at room temperature followed by treatment with acetic anhydride at 120 degrees C afforded 2-substitutedpyridines in good to high yields. Furthermore, by exchanging acetic anhydride for DMF in the second step, 2-substitutedpyridine N-oxides were obtained, as intermediates suitable for addition of a second Grignard reagent for the synthesis of 2,6-disubstituted
Three-Component Coupling Sequence for the Regiospecific Synthesis of Substituted Pyridines
作者:Ming Z. Chen、Glenn C. Micalizio
DOI:10.1021/ja2105703
日期:2012.1.18
A de novo synthesis of substituted pyridines is described that proceeds through nucleophilic addition of a dithiane anion to an α,β-unsaturated carbonyl followed by metallacycle-mediated union of the resulting allylicalcohol with preformed trimethylsilane-imines (generated in situ by the low-temperature reaction of lithium hexamethyldisilazide with an aldehyde) and Ag(I)- or Hg(II)-mediated ring closure
azabicyclic cyclopropanes (with Co catalyst). The rhodium-catalyzed 2H-pyrrole formation involving hydrogen shift is supported by deuterium-labeling experiments. The control experiments in the cobalt-catalyzed reaction indicate that the bicyclic aziridines as the primary product undergo a skeletalrearrangement assisted by metal iodide salts.