Facile synthesis of achiral and chiral PCN pincer palladium(II) complexes and their application in the Suzuki and copper-free Sonogashira cross-coupling reactions
摘要:
Five non-symmetrical PCN pincer palladium(II) complexes [PdCl{C6H3-2-(CH=NR)-6-(OPR'(2))}] (R = m-ClC6H4, R' = Ph (2a); R = Ph, R' = Ph (2b); R = i-Pr, R' = Ph (2c); R = m-ClC6H4, R' = i-Pr (2d); R = (S)-1-phenylethyl, R' = Ph (2e)) have been easily prepared in only two steps from readily available m-hydroxybenzaldehyde and characterized by HRMS, H-1 NMR, C-13 NMR, P-31 NMR and IR spectra. The molecular structures of 2a and 2b have been further determined by X-ray single-crystal diffraction. The obtained Pd complexes were found to be effective catalysts for the Suzuki and copper-free Sonogashira cross-coupling reactions which could be carried out in the undried solvent under air. (C) 2009 Elsevier B.V. All rights reserved.
Facile synthesis of achiral and chiral PCN pincer palladium(II) complexes and their application in the Suzuki and copper-free Sonogashira cross-coupling reactions
作者:Ben-Shang Zhang、Chao Wang、Jun-Fang Gong、Mao-Ping Song
DOI:10.1016/j.jorganchem.2009.04.002
日期:2009.7
Five non-symmetrical PCN pincer palladium(II) complexes [PdClC6H3-2-(CH=NR)-6-(OPR'(2))}] (R = m-ClC6H4, R' = Ph (2a); R = Ph, R' = Ph (2b); R = i-Pr, R' = Ph (2c); R = m-ClC6H4, R' = i-Pr (2d); R = (S)-1-phenylethyl, R' = Ph (2e)) have been easily prepared in only two steps from readily available m-hydroxybenzaldehyde and characterized by HRMS, H-1 NMR, C-13 NMR, P-31 NMR and IR spectra. The molecular structures of 2a and 2b have been further determined by X-ray single-crystal diffraction. The obtained Pd complexes were found to be effective catalysts for the Suzuki and copper-free Sonogashira cross-coupling reactions which could be carried out in the undried solvent under air. (C) 2009 Elsevier B.V. All rights reserved.