期刊
TETRAHEDRON LETTERS
卷 48, 期 45, 页码 8069-8073出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2007.09.011
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A simple protocol for the efficient preparation of substituted 6-phenyl-2,2'-bipyridine derivatives is described. An inverse Diels-Alder reaction between a 3-phenyl-5-pyridyl-1,2,4-triazine and an electron-rich ethynyl species at high temperature provides a mixture of two products easily separable by column chromatography. The most encumbered isomer is favoured, likely due to favourable pi-pi stacking interactions in the transition state. A variety of those ligands suitable for the synthesis of cyclo-metallated complexes have been produced. (C) 2007 Elsevier Ltd. All rights reserved.
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