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A convenient method for the preparation of 2-aryl(or methyl)sulfanylbenzo[b]thiophenes has been developed. Thus, aryl 2-aryl(or methyl)sulfanylmethylsulfanylphenyl ketones, easily prepared from readily available aryl 2-sulfanylphenyl ketones or 2-chloro-5-nitrophenyl phenyl ketone, are treated with LDA in 1,2-dimethoxyethane (DME) to give 3-aryl-2-aryl(or methyl)sulfanylmethylsulfanyl-2,3-dihydrobenzo[b]thiophen-3-ols,...
2-Acetyl-1,4-naphthoquinone was treated with pyrrolidine (or morpholine) enamines, derived from cyclic and acyclic ketones, in DMF at room temperature for 24-72 h to afford 3,4-disubstituted 1-pyrrolidino(or morpholino)-9,10-anthraquinones. On the other hand, when the treatment of 2-acetyl-1,4-naphthoquinone with enamines for 2 min was followed by addition of water and heating at 100 o C for...
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