期刊
TETRAHEDRON LETTERS
卷 48, 期 46, 页码 8246-8249出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2007.09.031
关键词
cross-coupling; aryl- and hetarylacetylenes; 3-imidazoline-nitroxyles; oxidative coupling; stable radicals
In the presence of Pd catalyst, 3-imidazoline nitroxyl radicals promote oxidative coupling (dimerization) of terminal alkynes even in the absence of Cu(II) additives. On the other hand, the Pd-free CuI-PPh3-K2CO3-DMF catalytic system leads to the efficient cross-coupling of 1-hydroxy-4-[2-(p-iodophenyl)vinyl]-2,2,5,5-tetramethyl-3-imidazoline-3-oxide with terminal aryl- and hetarylacetylenes with the formation of 4-[2-(aryl/hetarylethynyl)phenyl)vinyl]-2,2,5,5-tetramethyl-3-imidazoline-3-oxide-1-oxyls in 70-75% yields. (C) 2007 Elsevier Ltd. All rights reserved.
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