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2005
Polyphenyl derivatives
Q 0700
An Extremely Active Catalyst for the Negishi Cross-Coupling Reaction. — The
catalyst derived from biphenyl phosphine ligand BPH is highly active for the
06- 095 palladium
preparation of hindered biaryls (tri- and tetra-ortho-substituted). The reactions are performed with arylzinc chlorides, which are prepared in situ from the corresponding aryl
bromides or by directed ortho-lithiation. A wide range of functional groups as well as
heterocyclic halides as coupling partners are tolerated by the catalyst. In many cases a
catalyst loading with ≤ 0.5% Pd is sufficient to obtain good to excellent yields. —
(MILNE, J. E.; BUCHWALD*, S. L.; J. Am. Chem. Soc. 126 (2004) 40,
13028-13032; Dep. Chem., MIT, Cambridge, MA 02139, USA; Eng.) — Klein
2005
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