Herein an efficient and direct copper-catalyzed coupling of oxazoline-containing aryl bromides with electron-deficient secondary phosphine oxides is reported. The resulting tertiary phosphine oxides can be reduced to prepare a range of PHOX ligands. The presented strategy is a useful alternative to known methods for constructing PHOX derivatives.
[Casalnuovo, Albert L.; RajanBabu, T. V.; Ayers, Timothy A.; Warren, Timothy H. Journal of the American Chemical Society, 1994 , vol. 116, # 22 p. 9869 - 9882]
