期刊
TETRAHEDRON LETTERS
卷 46, 期 12, 页码 1967-1970出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2005.02.003
关键词
thiosemicarbazone; phosphine-free ligand; palladium complex; Suzuki-Miyaura cross-coupling; C-C bond formation; homogeneous catalysis
For the first time, palladium complexes with salicylaldehyde thiosemicarbazones were applied as catalyst precursors to the Suzuki-Miyaura reaction. These air and moisture stable phosphine-free systems efficiently catalyze the cross-coupling of aryl bromides and chlorides (from electron rich to electron poor) with phenylboronic acid in DMF/H2O at 100 degrees C for 24 h, using Na2CO3 as base, without addition of free ligand or any promoting additive, and under aerobic conditions no significant homocoupling of phenylboronic acid to unsubstituted biphenyl was observed. (C) 2005 Elsevier Ltd. All rights reserved.
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