Simple reaction conditions and recyclable reagents are an irreplaceable advantage for environmentally friendly industrial applications. An environment friendly, recyclable and economic strategy was developed to synthesize diaryl chalcogenides by the CuCl2 catalyzed C-S bond formation reaction via iodobenzenes and benzenethiols/1,2-diphenyldisulfanes using N,N’-dimethylethane-1,2-diamine (DMEDA) as ligand, base and solvent. For these reactions, especially the reactions of diiodobenzenes and aminobenzenethiols/disulfanediyldianilines, a range of substrates is compatible to give the corresponding products in good to excellent yields. Both the reaction reagents of the catalytic system (CuCl2/DMEDA) are inexpensive, conveniently separable and recyclable for more than 5 cycles.
The efficient “One-pot” CuCl2-catalyzed C–S bond coupling reactions were developed for the synthesis of dibenzo[b,f][1,4]thiazepines and 11-methy-ldibenzo[b,f][1,4]thiazepines via 2-iodobenzaldehydes/2-iodoacetophenones with 2-aminobenzenethiols/2,2′-disulfanediyldianilines by using bifunctional-reagent N, N′-dimethylethane-1,2-diamine (DMEDA), which worked as ligand and reductant. The reactions were compatible with a range of substrates to give the corresponding products in moderate to excellent yields.
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Two feasible and convenient SÀ S bond cleaving/cyclization reactions for the synthesis of 2-arylbenzothiazoles catalyzed by CuCl 2 or I 2 /DMSO via 2,2'-disulfanediyldianilines and aromatic aldehydes have been reported. The reactions are compatible with a range of substrates and could successfully generate 2-arylbenzothiazoles in moderate to excellent yields, respectively. For the reactions, 'one-pot' conditions were applied and readily available starting materials were employed. The importance of the protocols were attractive for synthetic method.
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