Synthesis of biphenyl-based phosphines by Suzuki coupling
摘要:
A series of phosphine oxides has been synthesised by the palladium-catalysed Suzuki coupling of arylboronic acids with OPPh2(o-C6H4Br). Oil reduction with trichlorosilane. functionalised. biphenyl-based phosphine ligands were obtained in good yields. Our preliminary results indicate these ligands to be effective for palladium-catalysed C-C coupling reactions including the formation of their own oxides. (C) 2001 Elsevier Science Ltd. All rights reserved.
Palladium-catalysed synthesis of biaryl phosphines
摘要:
Monodentate, biphenyl-type phosphines have emerged as a powerful class of ligands in homogeneous catalysis. Synthetic methods for these ligands are limited, however. We report that the palladium-catalysed Suzuki coupling of OPR2(o-C6H4X) (R=Ph, t-Bu; X=Br, I) with arylboronic acids affords a variety of biaryl phosphine oxides including those that contain heterocycles. The corresponding phosphines are readily obtained by treatment with HSiCl3. The methodology provides an easy entry to monodentate biaryl and heterobiaryl P<^>X (X=N, O, S) phosphines with diverse steric and electronic properties. (C) 2004 Elsevier Ltd. All rights reserved.