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Abstract: A combination of CuI (10mol%) and [bmim]OAc (20mol%) in [bmim]PF6 was found to be a highly efficient and readily recyclable catalytic system for the synthesis of 2,3-disubstituted benzo[b]furans via three-component tandem reactions of 2-hydroxybenzaldehydes, amines and alkynes. Remarkable advantages of this new strategy include high efficiency, convenient recovery and efficient reuse of the catalytic system. [Copyright &y& Elsevier]

Abstract: Commercially available and inexpensive ethylenediamine/Cu(OAc)2 · H2O has been found to be a highly effective catalyst system for the cyanation of aryl bromides in the solvent of NMP. At the same time, the highly activated aryl chlorides with NO2 groups gave corresponding benzonitriles in good yields. Similar to the previous observation, it is not necessary to use an excess of K4[Fe(CN)6] in the cyanation reaction (only 20mol% of K4[Fe(CN)6] was used). In other hand, a more remarkable KI-accelerated effect was observed for the cyanation reaction: the addition of KI increased the yield from 6% to 91% in the cyanation of bromobenzene. [Copyright &y& Elsevier]