A catalyst composed of [Pd(η3-C3H5)Cl]2 and N,N,N',N'-tetra(diphenylphosphinomethyl)pyridine-2,6-diamine (L) was found to be effective for one-pot synthesis of 2-substituted benzo[b]furans from 2-halophenols and alkynes. For 2-bromo-3-hydroxypyridine, the catalyst loading could be as low as 1 ppm and the turnover number (TON) was up to 870 000.
![Graphical abstract: One-pot synthesis of 2-substituted benzo[b]furans via Pd–tetraphosphine catalyzed coupling of 2-halophenols with alkynes](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C4CC00815D&imageInfo.ImageIdentifier.Year=2014)
R. Zhou, W. Wang, Z. Jiang, K. Wang, X. Zheng, H. Fu, H. Chen and R. Li, Chem. Commun., 2014, 50, 6023 DOI: 10.1039/C4CC00815D
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