Substituted (pyridinyl)benzoazole palladium complexes: Synthesis and application as Heck coupling catalysts
Artikel i vetenskaplig tidskrift, 2007

The synthesis of 2-(4-tert-butylpyridin-2-yl)-benzooxazole (L3), 2-(4-tert-butyl-pyridin-2-yl)-benzothiazole (L4) and 6-tert-Butyl-2(4-tert-butyl-pyridin-2-yl)-benzothiazole (L5) by intramolecular cyclization under basic conditions is described. Reactions of 2-pyridin-2-yl-1H-benzoimidazole (L2), 2-pyridin-2-yl-benzothiazole (L2) and L3-L5 with either [Pd(NCMe)(2)Cl-2)] or [Pd(COD)MeCl] afforded the corresponding mononuclear palladium complexes [Pd(L1)MeCl] (1), [Pd(L2)MeCl] (2), [Pd(L3)Cl-2] (3), [Pd(L3)MeCl] (4), [Pd(L4)Cl-2] (5), [Pd(L4)MeCl] (6) and [Pd(L4)MeCl] (7) as confirmed by mass spectrometry and elemental analyses. The palladium complexes are efficient Heck coupling catalysts for the reaction of iodobenzene with butylacrylate under mild conditions. Benzothiazole and benzooxazole containing complexes show faster induction periods compared to the benzoimidazole analogues. (C) 2007 Elsevier Ltd. All rights reserved.

reactions

ETHYLENE

palladium complexes

Heck coupling

AGENTS

PYRIDINE LIGANDS

POLYMERIZATION

benzoazoles ligands

catalysts

EFFICIENT

ARYLATION

Författare

S. O. Ojwach

University of Johannesburg

Gunnar Westman

Chalmers, Kemi- och bioteknik, Organisk kemi

J. Darkwa

University of Johannesburg

Polyhedron

0277-5387 (ISSN)

Vol. 26 18 5544-5552

Ämneskategorier

Kemi

DOI

10.1016/j.poly.2007.08.033