A concise and practical Cu-catalyzed protocol for the preparation of chloro- and bromoarenes via C-H bond activation has been developed. The advantages of this strategy are the employment of cheap Cu(NO3)2·3H2O, LiX and O2, and its compatibility with both electron-donating and electron-withdrawing substituents on aryl rings.
Give me a ring? An efficient approach has been developed for the intramolecular decarboxylative coupling of arene carboxylic acids/esters with aryl bromides catalyzed by palladium (see scheme). From a synthetic viewpoint, this method is highly attractive because the catalyst loading is low, the optimized reaction conditions are mild, and the substrate scope is broad.
Highly efficient and simple cross-coupling reactions of alkynylbromides with organoalane reagents for the synthesis of unsymmetrical 1,3-diynes derivatives using Ni(OAc)2 (2–5 mol%)/(o-furyl)3P (4–10 mol%) as a catalyst are reported.
Fourteen novel 1,2,4-triazole Schiff bases containing the 1-[bi-(4-fluorophenyl)methyl]piperazine group were prepared, in good yield (73-85 %), in five steps starting from 1-[bi-(4-fluorophenyl)methyl]piperazine and ethyl chloroacetate, with use of microwave irradiation. The structures of the new compounds were characterized by IR spectroscopy, MS, 1 H and 13 C NMR spectroscopy, and elemental analysis. Assay of the newly prepared compounds for bioactivity against tumor cells revealed that the most of the compounds had good to excellent inhibitory activity against CDC25B (99.70 % inhibition). The 4-amino-5-[4-bi-(4-fluorophenyl) methylpiperazin-1-ylmethyl]-1,2,4-triazole-3-thione group was found to be beneficial group improving anti-tumor activity to some extent.
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